X-rays are similar in nature to_______________?

A. Cathode rays
B. Positive rays
C. Γ-rays
D. Beta rays

When X-rays are passed through successive aluminum sheets what happens to their thickness ?

A. Increases
B. It decreases
C. It remains same
D. Sometimes increases and sometimes decreases

The value of critical angle for glass is_______________?

A. 42°
B. 47°
C. 52°
D. 50°

In optic fiber transmission system _____________ are used regenerate the dim light signal?

A. Diodes
B. Repeaters
C. Laser
D. Transformer

Magnification of the astronomical telescope is_____________?

A. Fo+fe
B. Fo/fe
C. Fe/fo
D. (1+fo/fe)l/fo

Errors in the transmission of power through optic fiber can be minimized by using a______________?

A. Multimode index fiber
B. Graded index fiber
C. Single mode step index fiber
D. Copper wire

The function of collimeter in spectrometer is________________?

A. To produce parallel beams of light
B. To filter the light rays
C. To make them
D. No function

In optic fiber transmission the repeater are separated through a distance of __________ km in newer system?

A. 300km
B. 200km
C. 100km
D. 20km

Michelson devised the formula to calculate the speed of light_______________?

A. C = 4fd
B. C = 8fd
C. C = 16fd
D. C = 5/2fd

A convex lens acts as a diverging lens if the_________________?

A. Object is beyond c
B. If the object is with in c
C. If the object is within f
D. Both b and c