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Questions and Answers
In what situation is a person more likely to see their reflection better in the glass?
In what situation is a person more likely to see their reflection better in the glass?
- When they are wearing colored glasses
- When they are outdoors in natural light
- When the glass is on a black sheet of paper
- When the glass is cleaned and on a white sheet of paper (correct)
What condition must be avoided for someone to donate their eyes?
What condition must be avoided for someone to donate their eyes?
- Of any age
- Suffering from Hepatitis B (correct)
- Suffering from diabetes
- Using spectacles
What is one key factor required for the donation of eyes after death?
What is one key factor required for the donation of eyes after death?
- The eyes must be removed within 12 hours
- The donation needs to take place in a hospital only
- The eyes have to be donated within 4-6 hours (correct)
- The person must have been a registered donor during their lifetime
Which of the following could be considered a reason for the weak eyesight in children, according to parents?
Which of the following could be considered a reason for the weak eyesight in children, according to parents?
What unique quality is attributed to a Braille kit mentioned for donation?
What unique quality is attributed to a Braille kit mentioned for donation?
What is the primary function of a periscope?
What is the primary function of a periscope?
How do plane mirrors affect the visibility of the back of your head at a hairdresser's?
How do plane mirrors affect the visibility of the back of your head at a hairdresser's?
What happens to reflected rays when they hit a second mirror?
What happens to reflected rays when they hit a second mirror?
How many images are formed when two plane mirrors are set at right angles to each other?
How many images are formed when two plane mirrors are set at right angles to each other?
Why would soldiers use periscopes in bunkers?
Why would soldiers use periscopes in bunkers?
In a kaleidoscope, how are the numerous patterns created?
In a kaleidoscope, how are the numerous patterns created?
What role does the adhesive tape play in the plane mirrors activity?
What role does the adhesive tape play in the plane mirrors activity?
What concept allows the periscope to function effectively?
What concept allows the periscope to function effectively?
Image formed by a plane mirror is characterized as which of the following?
Image formed by a plane mirror is characterized as which of the following?
Under what condition is the angle of incidence equal to the angle of reflection?
Under what condition is the angle of incidence equal to the angle of reflection?
If Boojho stands at A beside a plane mirror, what will be the visibility of his image?
If Boojho stands at A beside a plane mirror, what will be the visibility of his image?
What occurs to the position of the image in a plane mirror as Paheli moves from position B to position C?
What occurs to the position of the image in a plane mirror as Paheli moves from position B to position C?
How many images of a candle can be formed when placed between two parallel plane mirrors?
How many images of a candle can be formed when placed between two parallel plane mirrors?
If a ray of light reflects from a mirror at an incidence angle of 30°, what will be the angle of reflection?
If a ray of light reflects from a mirror at an incidence angle of 30°, what will be the angle of reflection?
What should Gurmit consider when advised against using a laser torch for Activity 13.8?
What should Gurmit consider when advised against using a laser torch for Activity 13.8?
In dim light, what happens to the size of the pupil?
In dim light, what happens to the size of the pupil?
What is the purpose of fixing a circular plane glass plate in the kaleidoscope construction?
What is the purpose of fixing a circular plane glass plate in the kaleidoscope construction?
Which angle of the mirrors is NOT mentioned as an example for the kaleidoscope construction?
Which angle of the mirrors is NOT mentioned as an example for the kaleidoscope construction?
What is the first step in making a kaleidoscope as described?
What is the first step in making a kaleidoscope as described?
What happens when two mirrors are set parallel to each other in the kaleidoscope?
What happens when two mirrors are set parallel to each other in the kaleidoscope?
What material is suggested for the construction of the tube for the kaleidoscope?
What material is suggested for the construction of the tube for the kaleidoscope?
How is the number of images of the object supposed to be recorded during the activity?
How is the number of images of the object supposed to be recorded during the activity?
What is the role of the adhesive tape in the kaleidoscope construction?
What is the role of the adhesive tape in the kaleidoscope construction?
Which of the following is true about sunlight as described?
Which of the following is true about sunlight as described?
What is the purpose of the cornea in the eye?
What is the purpose of the cornea in the eye?
Which part of the eye contains nerve cells that process visual information?
Which part of the eye contains nerve cells that process visual information?
What phenomenon does the dispersion of light create, as described in the activity?
What phenomenon does the dispersion of light create, as described in the activity?
How does the iris affect vision according to the description provided?
How does the iris affect vision according to the description provided?
What material can be used to enhance the visibility of the colors reflected on a wall?
What material can be used to enhance the visibility of the colors reflected on a wall?
Which of the following describes the function of the lens in the eye?
Which of the following describes the function of the lens in the eye?
In the activity involving the kaleidoscope, what does sunlight demonstrate by creating various patterns?
In the activity involving the kaleidoscope, what does sunlight demonstrate by creating various patterns?
What is the primary reason for designers to use kaleidoscopes?
What is the primary reason for designers to use kaleidoscopes?
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Study Notes
Luminous Objects and Reflection
- Luminous objects emit their own light.
- A periscope, constructed with two plane mirrors, utilizes reflected rays to view objects not directly visible.
- Periscopes are commonly used in submarines, tanks, and by soldiers in bunkers.
Multiple Images in Mirror Reflections
- A plane mirror produces a single image of an object.
- Using two plane mirrors at right angles creates multiple images.
- A kaleidoscope employs mirrors to produce numerous intricate patterns.
Activity: Making a Kaleidoscope
- Use three rectangular mirror strips to form a prism and place it in a tube.
- Closing one end with a cardboard disc with a central hole allows viewing of various patterns.
- The kaleidoscope contrasts patterns when viewed, providing unique visual experiences.
Sunlight and Dispersion of Light
- Sunlight is perceived as white light composed of seven colors.
- An activity using a bowl of water and a mirror can demonstrate the dispersion of light to reveal various colors on a wall.
Structure of the Human Eye
- The human eye has a spherical shape with a tough outer coat to protect its interior.
- The cornea is the transparent front part of the eye, allowing light to enter.
- The iris controls the size of the pupil, adapting to light conditions.
Light and Vision
- Vision occurs when light from objects enters the eyes.
- The lens focuses light onto the retina, which contains nerve cells responsible for processing visual information.
Common Questions
- The angle of incidence equals the angle of reflection in everyday scenarios.
- An image in a plane mirror is virtual, appears behind the mirror, and is the same size as the object.
- Placing an object between parallel mirrors can create multiple images based on their distance apart.
Eye Health and Care
- Eyes can be donated to assist those with corneal blindness.
- Donations can be made by individuals of any age or social status, with certain health exceptions.
- Awareness of eye care is essential; activities such as getting eyesight checked and understanding the experiences of visually impaired individuals are encouraged.
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