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physics

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121 questions


An astronomical telescope is said to be in normal adjustment...
An astronomical telescope is said to be in normal adjustment when the A. eye is accommodated B. focal length of objective lens is longer than t...
1 month ago 1 answer(s) 2 votes


The velocities of light in air and glass are 3.0 x 108ms-1 a...
The velocities of light in air and glass are 3.0 x 108ms-1 and 2.0 x 108ms-1 respectively. If the angle of refraction is 30°, the sine of the angle of in...
1 month ago 1 answer(s) 3 votes


The inside portion of part of a hollow metal sphere of diame...
The inside portion of part of a hollow metal sphere of diameter 20cm is polished. The portion will therefore form a A. concave mirror of focal length ...
1 month ago 1 answer(s) 2 votes