The muscles of a normal eye are least strained when the eye is focused on an object (a) far away from the eye

The light ray bends towards the normal. When a ray of light travels from an optically rarer medium to an optically denser medium, it gets bent towards the normal. Since...

(a) are relaxed and lens becomes thinner

(b) (ii) and (iii) 

Light ray travelling in air and entering obliquely into water is bent towards the normal; because the speed of the ray decreases in water.

For normal vision, the near point is about 25 cm and far point is infinity. Thus, a normal eye can see objects clearly that are between 25 cm and infinity.

In most relaxed state.

The correct answer is (a) =x

(b) The north pole faces the ring and the magnet moves towards it. (c) The south pole faces the ring and the magnet moves away from it.

I walked about 7-8 kilometres at one time and I think I can walk as far as up to 15 kilometres at a time.

(d) Indonesia consists of 13,677 islands (nearly 14,000) and this country is 5000 miles from Torres strait. 4th largest country in Asia.