Dispersion of Light
Things that give off light are known as
non luminous objects
luminous objects
transparent objects
opaque objects
luminous objects
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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
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 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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