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Two slits are spaced 0.3 mm apart and are placed 50 cm from a screen. Then the distance between the second and the third dark lines when the slits are illuminated with light of 600 mm wavelength is-

2 mm

In Young's experiment of interference, a torch is a used in place of the sodium lamp. Which of the following statement is correct?

Colored fringes will be produced

There are several reasons why a lens may not produce a sharp image of an object point. Which one of the following is the valid reason?

The lens is diverging

The resolving power of a lens is-

Its ability to separate the images of two points that are close together 

A person while moving towards a mountain at a speed of 4 m/s hears a sound of frequency 510 Hz located behind him and its echo after reflection from the mountain the best frequency of the two sounds is


When the blue glass is heated the color of glow will be-


At 27deg c longitudinal wave in which medium Will have the maximum velocity?


A Nichol prism is based on the action of-

Double refraction

When a body travels with a velocity greater than the velocity of sound than the shape of the wave front will be


A whistling engine is approaching a stationary observes with a velocity of 40 m/s. The velocity of sound in 330 m/s. The ratio of frequencies as heart by the observes at the time of approaching and passing of train is-


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