Physics Chapter: Light and Reflection

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Questions and Answers

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?

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?

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?

The absence of regular eye check-ups Signup and view all the answers

What unique quality is attributed to a Braille kit mentioned for donation?

It aids visually impaired individuals in communication Signup and view all the answers

What is the primary function of a periscope?

To allow viewing of objects not directly visible Signup and view all the answers

How do plane mirrors affect the visibility of the back of your head at a hairdresser's?

They form only a single image of the object Signup and view all the answers

What happens to reflected rays when they hit a second mirror?

They can be reflected again Signup and view all the answers

How many images are formed when two plane mirrors are set at right angles to each other?

Multiple images based on angle Signup and view all the answers

Why would soldiers use periscopes in bunkers?

To observe their surroundings without being seen Signup and view all the answers

In a kaleidoscope, how are the numerous patterns created?

By the multiple reflections between mirrors Signup and view all the answers

What role does the adhesive tape play in the plane mirrors activity?

It secures the mirrors in position Signup and view all the answers

What concept allows the periscope to function effectively?

Reflection of light Signup and view all the answers

Image formed by a plane mirror is characterized as which of the following?

virtual, behind the mirror and of the same size as the object. Signup and view all the answers

Under what condition is the angle of incidence equal to the angle of reflection?

Always Signup and view all the answers

If Boojho stands at A beside a plane mirror, what will be the visibility of his image?

He can only see his image. Signup and view all the answers

What occurs to the position of the image in a plane mirror as Paheli moves from position B to position C?

The image follows Paheli's movement directly. Signup and view all the answers

How many images of a candle can be formed when placed between two parallel plane mirrors?

Infinite images Signup and view all the answers

If a ray of light reflects from a mirror at an incidence angle of 30°, what will be the angle of reflection?

30° Signup and view all the answers

What should Gurmit consider when advised against using a laser torch for Activity 13.8?

Lasers could harm her eyesight. Signup and view all the answers

In dim light, what happens to the size of the pupil?

It dilates. Signup and view all the answers

What is the purpose of fixing a circular plane glass plate in the kaleidoscope construction?

To hold the colored glass pieces Signup and view all the answers

Which angle of the mirrors is NOT mentioned as an example for the kaleidoscope construction?

30° Signup and view all the answers

What is the first step in making a kaleidoscope as described?

Join three rectangular mirror strips Signup and view all the answers

What happens when two mirrors are set parallel to each other in the kaleidoscope?

Multiple images are created Signup and view all the answers

What material is suggested for the construction of the tube for the kaleidoscope?

Chart paper Signup and view all the answers

How is the number of images of the object supposed to be recorded during the activity?

By writing down the observations directly Signup and view all the answers

What is the role of the adhesive tape in the kaleidoscope construction?

To tape the mirrors together at an angle Signup and view all the answers

Which of the following is true about sunlight as described?

It is made up of seven colors Signup and view all the answers

What is the purpose of the cornea in the eye?

To protect the inner structures of the eye Signup and view all the answers

Which part of the eye contains nerve cells that process visual information?

Retina Signup and view all the answers

What phenomenon does the dispersion of light create, as described in the activity?

Formation of a rainbow Signup and view all the answers

How does the iris affect vision according to the description provided?

It adjusts the amount of light entering the eye Signup and view all the answers

What material can be used to enhance the visibility of the colors reflected on a wall?

White paper Signup and view all the answers

Which of the following describes the function of the lens in the eye?

It focuses incoming light onto the retina Signup and view all the answers

In the activity involving the kaleidoscope, what does sunlight demonstrate by creating various patterns?

The spectrum of colors within light Signup and view all the answers

What is the primary reason for designers to use kaleidoscopes?

To obtain inspiration for new patterns Signup and view all the answers

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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Description

Explore the fascinating world of luminous objects, reflections, and the science behind periscopes and kaleidoscopes in this quiz. Learn how light travels, dispenses, and creates multiple images through mirrors. Test your knowledge with engaging activities and experiments related to light.