Indian army has published the notification for SSC Tech 56 men and SSC Tech 27 women for the course commencing at OTA Chennai from April 2021
The refractive index of fused quartz is 1.46 and that of sapphire is 1.77. If Vq is the speed of light in quartz and vs is the speed of light in sapphire, then which one of the following relations is correct?
Vq > Vs
Vq < Vs
Vq = Vs
Vs = Vq /2
A lens has a power of +2.0 Dioptre. Which one of the following statements about the lens is true?
The lens is concave and has a focal length of 0.5 meter
The lens is convex and has a focal length of 20 meter
The lens is convex and has a focal length of 0.5 meter
The lens is concave and has a focal length of 20 meter
The correct relation between the radius of R and focal length f of a spherical mirror is
R = f
R = 2f
R = 3f
R = 4f
Light enters the eye through a thin membrane called
retina
cornea
pupil
iris
A lemon kept in water in a glass tumbler appears to be larger than its actual size. It is because of
reflection of light
scattering of light
refraction of light
polarization of light
