Please wait...
1800-212-7858 (Toll Free)
9:00am - 8:00pm IST all days


Thanks, You will receive a call shortly.
Customer Support

You are very important to us

For any content/service related issues please contact on this toll free number


Mon to Sat - 11 AM to 8 PM

CBSE - X - Physics - Light - Reflection and Refraction

where should we move  the concave mirror towards the screen or away from the screen if we obtain a blurred image of a distant object in the practical of the finding of the focal length of a concave mirror .Also answer this question if in the place of concave mirror there is convex lens.

Asked by krishnapriya20 25th February 2015, 5:53 PM
Answered by Expert


For a mirror or a lens, a sharp image is obtained only when the screen is at the focus of that mirror or the lens.
The image will be blurred if the screen is moved towards either side of the focus.
Hence, the concave mirror or the concave lens should be moved either towards or away from the screen.
If by moving it towards the screen the image is getting clearer, then continue moving towards or move it away.
Answered by Expert 26th February 2015, 2:38 PM

Rate this answer

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10

You have rated this answer /10

Report an issue
Your answer has been posted successfully!