Optics Answers

Discuss the significance of accommodation and convergence of human eye in respect
of perception of light.

collect at least six convex lenses of different thicknesses and apertures. Find their approximate focal length by making the clear image of a distant object on the wall and then measuring the distance between the lens and the wall. Select the best pair of lenses foe making a refraction type astronomical telescope. Write the criteria you have kept in mind while making the choice of pair of lens. Set the telescope for normal adjustment. Select a third lens to make the final image erect. Find the magnifying power and telescopic length in the setting.

Could you please explain the following with an illustration:
Astigmatism results when a lens is unable to bring light passing through one part of a lens to the same focal point as light passing through another part.

Is the following correct?
Spherical abberation is corrected by using compound lens system, each being a combination of SEVERAL concave and convex lenses.

if sin i is 3/5 what is tan i......

how do i determine the energy of a photon with a save length of 3.5 x 10^-8 (negative 8) m? When C= 3.00 x 10^8 m/s H= 6.63 x 10^-34 J-s

what is optics

The focal length of a converging lens is 20 cm. The image of the object placed 60 cm from the centre of this lens is real and __________________

You have two plane mirrors of sizes 6 ft and 10 ft. The focal length of these two
mirrors are