Define : Optical centre and focal length of a lens.

An object is placed in between the optical centre and focus of a thin convex lens. What is the nature of image of the object?

A convex lens whose redius of curvatures of both surfaces are same, refractive index 1.5 an focal length is 15cm . If it is immerged into a liquid of refractive index 1.7 what will be the focal length of he lesns?

An object placed at a distance of 16cm from a convex lens produces an image of magnification m(m gt 1) . If the object is moved towards the lens by 8cm then again an image of magnification m is obtained. The numerical value of the focal length of the lens is

A watch repairer kept a magnifying glass very close to his eyes and found that the magnifying power of the glass was 8. if the least distance of distinct vision of the eye is 25 cm , calculate the focal length of the lens .

Define: class-length

The process of necessary adjustment of focal length of the lens in human eye is called_______.

The process of necessary adjustment of focal length of the lens in human eye is called_____.

Write "Yes" or "No" For distant object accommodation, Ciliary muscles relaxes as a result the lens becomes thin and Focal length of the lens increased.