Question

82)For a specific glass lens f=0.5 .This is the only Information given to the student.

Which type of lens is given to him and what is its power?​

Answer 1

Explanation:

power 2D;convex lens

hope you will understand

Answer 2

Question - 82)For a specific glass lens f=0.5 metre .This is the only Information given to the student.

Which type of lens is given to him and what is its

power?

The answers are as follows -

• As per the focal length of lens to be 0.5, the lens is convex lens.
• The power of lens will be calculated as : 1/0.5 = 2 D or 2 Dioptre.
• Focal length of convex lens is always positive. This is due to the reason that convex lens converges the light rays. This results in image formation infront of the lens and hence positive focal length.