CameraIcon

SearchIcon

MyQuestionIcon

2

You visited us 2 times! Enjoying our articles? Unlock Full Access!

Making a Plane Mirror

82. The separ...

Question

82. The separation between the screen and a plane mirror is 2r. An isotropic point source of light is placed exactly midway between the mirror and the screen. Assume that mirror reflects 100% of incident light. Then the ratio of illuminances on the screen with and without the mirror is A) 10 : 1 B) 2 : 1 C) 10 : 9 D) 9 : 1

Open in App

Solution

Suggest Corrections

thumbs-up

2

Similar questions

Q. A point source of light is 60 cm from a screen and is kept at the focus of a concave mirror which reflects light on the screen. The focal length of the mirror is 20 cm. The ratio of average intensities of the illumination on the screen when the mirror is present and when the mirror is removed is

Q. A long horizontal slit is placed 1 mm above a horizontal plane mirror. The interference between the light coming directly from the slit and that after reflection is seen on a screen 1 m away from the slit. If the mirror reflects only

64 %

of the light falling on it, the ratio of the maximum to the minimum intensity in the interference pattern observed on the screen is:

Q. In the figure shown,

O

is a point source of light and

S

is a screen placed at a distance

L

from the source. The intensity of light at point

A

on the screen due to the source is

81 I

I

is some unit. Now a large mirror

(M)

is placed behind the source at a distance

L

from it. The mirror reflects

100 %

of the light energy incident on it. The intensity at point

A

n I .

n

is (integer only)

Q. A small plane mirror placed at the centre of a spherical screen of radius R. A beam of light is falling on the mirror. If the mirror makes n revolution. per second, the speed of light on the screen after reflection from the mirror will be

Q. A point source of light is placed in front of a plane mirror as shown in the fig. Determine the length of reflected path of light on the screen (

\sum

).

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Making of a Plane Mirror

PHYSICS

Watch in App

explore_more_icon

Explore more

Making a Plane Mirror

Standard VIII Physics

Join BYJU'S Learning Program

CrossIcon