The speed of light in common glass is………..
a) 3× 108m/s
b) 2× 108m/s
c) 8× 108m/s
d) 6× 108m/s
A reflecting prism is made of transparent material (glass) which has……..rectangular surface and…….. triangular surface.
a) three, two
b) four, two
c) two, three
d) two, four
When………light pass from prism it
gives seven colors. NTS PET 24/08/2019 (1:30)
a) infrared
b) ultraviolet
c) white
d) x-rays
In the deserts, mirage (is a natural optical phenomena in which we see an inverted image of the distant objects on road and desert during hot summer days) is seen due to which phenomenon ………………..
a) Reflection
b) Refraction
c) Diffraction
d) Total internal reflection
Mirages happen when the ground is
very hot and the air is……..
a) cool
b) little hot
c) very hot
d) all of these
The upper color of rainbow is………………..
a) Green
b) Red
c) Yellow
d) violet
