Ray and beam - class-VII
Description: ray and beam | |
Number of Questions: 23 | |
Created by: Mira Shah | |
Tags: reflection of light and shadow light physics |
Which of the following is correct for the beam which enters the medium ?
The speed at which the light travels in vacuum is.
If a parallel beam of light having intensity I is incident normally on a perfectly reflecting surface, the force exerted on the surface, equal F. When the surface is held at an angle $ \theta $ the force is
The shape of spot light produced when bright sunshine passes perpendicular through a hole of very small size, is:
A light is said to be divergent when :
A light is said to be convergent when :
A narrow stream of light is called as :
A broad stream of light is called a :
A beam of light is made up of:
Which of the following is the sources of light?
Which of the following is true about observation of light?
Which of the following is not the sources of light?
In which of the following natural light can be observed?
Physical processes are sometimes described visually by lines. Only the following can cross.
A glass slab is placed in the path of convergent light.. The point of convergence of light .......... .
A beam of light passes through layers of following different substances each 10 cm thick normally. In which substance does the beam take more to pass through?
Sun rays on the surface of the earth
A wave $ y = 10 sin (ax + bt) $ is reflected fron a dense medium at an origin. if 81% of energy is reflected thn the equation of reflected wave is :
If the angle of elevation of sun increases from ${0}^{o}$ to ${90}^{o}$ then what will be the change in length of shadow of tower?
In a room lighted by an electric bulb, it is found that the shadow of the ceiling fan hung in the centre is falling on a wall opposite to the door. What can you say about the position of the bulb?
Which of the following statement is true?