Home
Class 12
PHYSICS
Light from a point source falls on a scr...

Light from a point source falls on a screen. If the separation between the source and the screen is increased by 1%, the illuminance will decrease (nearly) by

A

0.5%

B

1%

C

2%

D

4%

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • PHOTOMETRY

    HC VERMA|Exercise Objective 2|4 Videos

  • PHOTOMETRY

    HC VERMA|Exercise Exercises|16 Videos

  • PHOTOMETRY

    HC VERMA|Exercise Short Answer|8 Videos

  • PHOTO ELECTRIC EFFECT AND WAVE PARTICLE DUALITY

    HC VERMA|Exercise Exercise|2 Videos

  • SEMICONDUCTOR AND SEMICONDUCTOR DEVICES

    HC VERMA|Exercise Exercises|35 Videos

Similar Questions

Explore conceptually related problems

If distance between source and screen increases by 2%, then intensity obtained at screen will be .......

White light is used to illuminate the two slits in a Young's double slit experiment. The separation between the slits is b and the screen is at a distance d (gt gtb) from the slits At a point on the screen directly in front of one of the slits, certain wavelengths are missing some of these missing wavelengths are

A beam of light of lambda= 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between first dark fringes on either side of the central bright fringe is ...

At which depth from earth surface acceleration due to gravity is decreased by 1%

State two conditions to obtain sustained interference of light. In young's double slit experiment, using light of wavelength 400 nm, interference fringes of width X are obtained. The wavelength of light is increased to 600 nm and the separation between the slits is halved. if one wants the observed fringe width on the screen to be the same in the two cases, find the ratio of the distance between the screen and the plane of the slits in the two arrangements.

In Young's double slit experiment, the distance between slits and the screen is 1.0 m and monochromatic light of 600 nm is being used. A person standing near the slits is looking at the fringe pattern. When the separation between the slits is varied, the interference pattern disappears for a particular d_(0) between the slits

In a Young's double slit experiment, the separation between the slits is 0.15 mm. In the experiment, a source of light of wavelength 589 nm is used and the interference pattern is observed on a screen kept 1.5 m away. The separation between the successive bright fringes on the screen is

As shown in the right figure, a point light source is placed at distance 2f from a lens with focus length f. and a screen is placed at 4f from the lens. The lens is then cut at the middle into two equal portions: upper half and lower half. the upper half is moved upwards by a small distance d comparable to the light wavelength and the lower half is moved downwards by the same distance d. What is the light pattern on the screen?

A wire in the form of a tightly wound solenoid is connected to a DC source, and carries a current. If the coil is stretched so that there are gaps between successive elements of the spiral coil, will the current increase or decrease? Explain.