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Questions and Answers
What are the two laws of reflection?
What are the two laws of reflection?
- Reflection angle equals refracted angle, and incident ray, refracted ray, and normal all lie on the same plane
- Incident angle equals reflected angle, and incident ray, refracted ray, and normal all lie on the same plane
- Refraction angle equals incident angle, and incident ray, refracted ray, and normal all lie on the same plane
- Reflection angle equals incident angle, and incident ray, reflected ray, and normal all lie on the same plane (correct)
Why is red colour selected for danger light signals?
Why is red colour selected for danger light signals?
- Red light has the longest wavelength, making it visible from a distance
- Red light has a soothing effect on the eyes in stressful situations
- Red light is least scattered by fog or smoke, ensuring better visibility (correct)
- Red light has the shortest wavelength, making it more noticeable during the day
What is meant by the term power of accommodation? Name the part of our eye that is responsible for the power of accommodation.
What is meant by the term power of accommodation? Name the part of our eye that is responsible for the power of accommodation.
- Power of accommodation refers to the ability of the eye to distinguish between colors. The cornea is responsible for the power of accommodation.
- Power of accommodation refers to the ability of the eye to focus on objects at varying distances. The iris is responsible for the power of accommodation. (correct)
- Power of accommodation refers to the ability of the eye to perceive depth. The sclera is responsible for the power of accommodation.
- Power of accommodation refers to the ability of the eye to adjust to different light levels. The pupil is responsible for the power of accommodation.
What is dispersion of light?
What is dispersion of light?
Which type of mirror is used outside the driver's side of a vehicle?
Which type of mirror is used outside the driver's side of a vehicle?
A doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?
A doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?
Why is a convex mirror preferred as a rear-view mirror in vehicles?
Why is a convex mirror preferred as a rear-view mirror in vehicles?
What is the definition of refraction of light?
What is the definition of refraction of light?
What is the mirror image of the word 'AMBULANCE'?
What is the mirror image of the word 'AMBULANCE'?
What is the mirror formula used in optics?
What is the mirror formula used in optics?
What are the two laws of reflection?
What are the two laws of reflection?
List three differences between real and virtual images.
List three differences between real and virtual images.
Why is red color selected for danger light signals?
Why is red color selected for danger light signals?
Name the three common defects of vision and their causes.
Name the three common defects of vision and their causes.
What are two uses of concave mirrors?
What are two uses of concave mirrors?
Define power of lens and write its S. I. unit.
Define power of lens and write its S. I. unit.
Q1 What is your Name?
Q1 What is your Name?
Q2 What is Apple?
Q2 What is Apple?
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Study Notes
Laws of Reflection
- The two laws of reflection are: the incident ray, reflected ray, and normal to the mirror at the point of incidence all lie in the same plane, and the angle of incidence is equal to the angle of reflection.
Color Selection
- Red color is selected for danger light signals because it has the longest wavelength and is least scattered by the atmosphere, making it more visible from a distance.
Power of Accommodation
- The power of accommodation is the ability of the eye to focus on objects at different distances by changing the curvature of the lens.
- The part of the eye responsible for the power of accommodation is the ciliary muscle.
Dispersion of Light
- Dispersion of light is the separation of white light into its component colors due to the different refractive indices of the medium for different wavelengths.
Mirrors in Vehicles
- A convex mirror is used outside the driver's side of a vehicle because it provides a wider field of view and reduces the blind spot.
Lenses
- A corrective lens of power +1.5 D has a focal length of 1/1.5 = 0.67 m.
- The prescribed lens is converging.
- Convex mirrors are preferred as rear-view mirrors in vehicles because they provide a wider field of view and reduce the blind spot.
Refraction
- Refraction of light is the bending of light as it passes from one medium to another with a different optical density.
Mirror Image
- The mirror image of the word 'AMBULANCE' is 'ECNALUBMA'.
Mirror Formula
- The mirror formula is 1/f = 1/do + 1/di, where f is the focal length, do is the object distance, and di is the image distance.
Differences between Real and Virtual Images
- Real images are formed on a screen, whereas virtual images are not formed on a screen.
- Real images are inverted, whereas virtual images are upright.
- Real images are formed by converging lenses, whereas virtual images are formed by diverging lenses.
Color Selection
- Red color is selected for danger light signals because it has the longest wavelength and is least scattered by the atmosphere, making it more visible from a distance.
Defects of Vision
- The three common defects of vision are myopia (nearsightedness), hyperopia (farsightedness), and astigmatism.
- Causes: myopia is caused by the elongation of the eyeball, hyperopia is caused by the shortening of the eyeball, and astigmatism is caused by the irregular curvature of the cornea.
Uses of Concave Mirrors
- Concave mirrors are used in solar ovens to focus sunlight and in makeup mirrors to provide a magnified image.
Power of Lens
- The power of a lens is the degree to which it converges or diverges light.
- The S.I. unit of power of a lens is diopter (D).
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