Dispersion of Light
When light enters water from air, its speed decreases to
20,000 km/s
25,000 km/s
200,000 km/s
250,000 km/s
250,000 km/s
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The speed of light in ‘vacuum’ isA. 3,000 km/s
B. 30,000 km/s
C. 300,000 km/s
D. 3,000,000 km/s
Things that give off light are known as
A. non luminous objects
B. luminous objects
C. transparent objects
D. opaque objects
We see different colors on screen because dots change their
A. colors
B. brightness
C. sharpness
D. size
The sensitive screen at the back of eye is called
A. blind spot
B. conjunctiva
C. cornea
D. retina
The number of red cells in an eye is
A. 320 million
B. 120 million
C. 220 million
D. 200 million
The critical angle is basically the
A. angle of incidence
B. angle of refraction
C. angle of reflection
D. angle of rarefaction
The concave lens is also known as
A. converging lens
B. diverging lens
C. dispersing lens
D. conducting lens
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