Light Shadows A...

Rectilinear propagation of light means that

A tube light is a/an

Directions: In this question, two statements A and B are given. Read the two statements carefully and choose the correct option accordingly.

Statement A: We cannot see our image in the mirror in a completely dark room because there is no light to reflect.
Statement B: We cannot see objects through a T-shaped pipe because light travels in a straight line.

What is/are the essential condition(s) to form a shadow?

(a) The object should be in a dark room.
(b) The object must be placed in the path of light.
(c) There should be a source of light and a screen.
(d) The object must be a luminous object.

A shadow moves on the screen when

A. the source moves parallel to the screen
B. the object moves parallel to the screen
C. the source moves away from the screen
D. colour of the source light changes

Which of the following statements is/are false?

(a) Pinhole camera produces an erect image.
(b) Pinhole camera produces a shadow.
(c) Pinhole camera produces an image.
(d) Pinhole camera produces an inverted image.

Directions: Study the given text and answer the following question.

When we pass under a tree covered with large number of leaves, we notice small patches of sunlight under it. These circular images are, in fact, pinhole images of the Sun. The gaps between the leaves act as the pinholes. These gaps are all kinds of irregular shapes, but we can see circular images of the Sun. This is called a natural pinhole camera.

Which of the following is/are true about a natural pinhole camera?

If a ray of light is incident on a plane mirror at an angle of 20° with the mirror, then what will be the angle of reflection?

John is 130 cm tall and standing at a distance of 3 m from a plane mirror. What is the distance between John and his image?

A plane mirror is cut horizontally to half its height. The image of an object formed in the plane mirror will be

(a) upright
(b) real
(c) as far behind as the object is in front of it

Observe the picture given below:



A patch of light is obtained at B, when the torch is shown as above. Which of the following is kept at A to get this patch of light?

What is the value of θ in the following figure?

In which type of reflection do all the incident rays travel in the same direction parallel to one another, and consequently the corresponding reflective angles are also the same?

Into which category can a piece of red hot iron be placed?

Which of the following statements is not true?

Which of the following statements is/are false?

a. Planets reflect the light of the Sun falling on them.
b. A non-luminous body can be made a luminous body by cooling it.
c. Anything through which light energy can pass partially or wholly is called an optical medium.

In a plane mirror, if an object moves by a distance 'x', then what is the distance moved by the image with respect to the object?

Match the following:

A lady is standing in front of a plane mirror at a distance of 1 m from it. She walks 60 cm towards the mirror. The distance of her image now from herself (ignoring the thickness of the mirror) is

A pencil of light is incident on a plane mirror and when reflected back, it forms a real image. The pencil of light incident on the plane mirror is