Human Eye and C...

Angle of deviation is between :

The film of camera is compared to which part of human eye?

Mirages are observed in deserts due to the phenomenon of

Which of the following is not a characteristics of a concave lens?

In hypermetropia, the image of near object is formed :

In myopia, the image of distant object is formed :

The least distance of distinct vision for a defective eye is $$75$$ cm. What should be the focal length of the lens which will be used to read a book clearly at $$25$$ cm?

For a normal eye, the far point is at infinity and the near point of distinct vision is about $$25\ cm$$ in front of the eye. The cornea of the eye provides a converging power of about $$40$$ dioptres, and the least converging power of the eye - lens behind the cornea is about $$20$$ dioptres. From this rough data estimate the range of accommodation (i.e., the range of converging power of the eye-lens) of a normal eye.

The muscles of a normal eye are least strained when the eye is focused on an object .....

Assertion: Blue colour of sky appears due to scattering of blue colour.
Reason: Blue colour has shortest wave length in visible spectrum.