Home
Class 12
PHYSICS
A 16 cd lamp placed at a distance of 125...

A 16 cd lamp placed at a distance of 125 cm from a screen produces the same illuminance on the screen as that produced by a bulb placed at a distance of 175 cm from the scree. If the bulb takes 0.85 A current at 110, find its efficiency.

Promotional Banner

Topper's Solved these Questions

  • RAY OPTICS

    SL ARORA|Exercise Problems For Self Practice|109 Videos

  • RAY OPTICS

    SL ARORA|Exercise TYPE F|10 Videos

  • RAY OPTICS

    SL ARORA|Exercise Problems|26 Videos

  • OPTICAL INSTRUMENTS

    SL ARORA|Exercise Problems for self practice|35 Videos

  • SOLIDS AND SEMICONDUCTOR DEVICES

    SL ARORA|Exercise PROBLEM_TYPE|9 Videos

Similar Questions

Explore conceptually related problems

Find the luminous intensity of the sun if it produces the same illuminance on the earth as produced by a bulb of 10000 candela at a distance 0.3 m . The distance between the sun and the earth is 1.5 xx 10^(11) m

An object is placed at a distance of 75 cm from a screen. Where should a convex lens of focal length 12 cm be placed so as to obtain a real image of the object?

A lamp placed 70.0 cm from a screen on one side produces the same illumination as a standard 60 cd lamp placed 105 cm away on the other side of the screen. What is the luminous intensity of the first lamp ?

A converging lens of focal length 5 cm is placed at a distance of 20 cm from a screen. How far from the lens should an object be placed so as to form its real image on the screen?

An object is placed at a distance of 1.5 m from a screen and a convex lens is interposed between them. The magnification produced is 4 . What is the focal length of the lens ?

An object is placed at a distance of 1.5 m from a screen and a convex lens is interposed between them. The magnification produced is 4 . What is the focal length of the lens ?