i. A person 1 m in front of a plane mirror seems to be 2 m from his image.
ii. If you touch your left ear with right hand in front of a plane mirror it will be seen in the mirror that your right ear is touched with left hand.
iii. The size of the pupil becomes large when you see in dim light.
iv. Night birds have lesser cones than rods in their eyes.
v. In the iris, there is a small opening called the pupil.
vi. The impression of an image does not vanish immediately from the retina. It persists there for about 1/16th of a second.
vii. If still images of a moving object are flashed on the eye at a rate faster than 16 per second, then the eye perceives this object as moving.
i. The moon is not an illuminated object. F
ii. Interesting feature of a kaleidoscope is that you will never see the same pattern again. T
iii. Sunlight, called white light, consists of eight colours. F
iv. Visually challenged persons can read and write using Braille system. T
v. Two mirrors inclined to each other give multiple images. T
vi. Light is reflected from all surfaces. T
Ans. Blind spot
Ans. Night blindness
Ans. Regular reflection
Ans. Eye lens
Ans. Optic nerve carries images to the brain.
Ans. The periscope makes use of two plane mirrors.
Ans. (a) Always
Ans. Infinite number of images of the candle will be formed.
Ans. The diffuse reflection of light takes place from a rough surface.
Ans. Regular reflection of light takes place from a smooth surface.
Ans. Images are formed by regular reflection.
Ans. The light ray, which strikes any surface, is called the incident ray.
Ans. The human eye has convex lens.
Ans. Important parts of the eye are cornea, iris, pupil, lens, retina and optic nerve.
Ans. The angle between the normal and incident ray is called the angle of incidence (∠i).
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