10th Class Physics MCQS
Speed of light in air is ms 1
3 x 1011
3 x 108
3 x 105
340
Concave mirror formula is given by:
sin<i/sin<r
1/f=1/p+1/q
R = 2r
1/f=1/p 1/q
An object of placed at he centre of curvature of a concave mirror. The image produced by the mirror is located:
at the centre of curvature
out beyond the centre of curvature.
at the focal point
between the centre of curvature and the focal point
Power of convex lens is 10 D. Its focal length is:
1 m
10 m
0.1 m
100 m
Optical fibers work on the principle of:
Total internal reflection
Reflection
Refraction
Diffraction
Hard disk is made of:
Plastic
Copper
Aluminium
Iron
The minimum value of angle of deviation is called:
Minimum angle
incident angle
angle of minimum deviation
None of these
The ray of light striking to the side of prism is called:
refraction ray
incident ray
emergent ray
reflected ray
Optical fibre are:
Cheap
Lighter
All of these
Flexible
The refractive index of internal coating of optical fibre is:
1.56
1.53
1.51
1.58
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