List of top Physics Questions on Light

When light enters a different medium, its wavelength changes because:
An object is placed 10 cm in front of a concave mirror with a focal length of 20 cm. What is the magnification produced?
Let us consider interference between two sources of intensities I and 4I. What will be the intensity at points where the phase difference is π?
The relative permittivity of distilled water is 81. What is the velocity of light in the distilled water?
Given below are two statements:
Statements-I: Compton effect can be explained on the basis of wave nature of light.
Statements-II: Diffraction pattern of light can be explained on the basis of particle nature of light.
In the light of the above statements, choose the correct answer from the options given below.
Which colour of the light has the longest wavelength?

Two coherent point sources \( S_1 \) and \( S_2 \) vibrating in phase emit light of wavelength \( \lambda \). The separation between them is \( 2\lambda \). The light is collected on a screen placed at a distance \( D \gg \lambda \) from the slit \( S_1 \) as shown. The minimum distance, so that intensity at \( P \) is equal to intensity at \( O \), is:

Which source is accociated with line emission spectrum?
Light of wavelength 5500 Å from narrow slit is incident on a double slit. The overall separation of 5 fringes on a screen 200 cm away is 1 cm. Calculate slit seperation.
The velocity of light in vacuum is ________
A light meter measures the intensity \( I \) of the light falling on it. Theory suggests that this varies as the inverse square of the distance \( d \). Which graph of the results supports this theory?
light meter measures the intensity I of the light