Dispersion of Light
The number of red cells in an eye is
320 million
120 million
220 million
200 million
120 million
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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
When light enters water from air, its speed decreases to
A. 20,000 km/s
B. 25,000 km/s
C. 200,000 km/s
D. 250,000 km/s
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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