Why does it take some time to see objects in a dim room when you enter the room from bright sunshine outside ?

(i) Stay away from poles or other metallic objects.  (ii) Stay away from tall trees.  (iii) Stay away from open vehicles like motorbikes, tractors, construction machinery etc. (If a child gives any...

(A) can take different values 

When we see in a completely dark room, we are not able to see anything because there is no light in the dark room.  (a) We can see bulb due to...

Solution : (a) Cones (b) Rods

The normal eye is not able to see clearly the objects placed closer than 25 cm because all the power of accomodation of the eye is exhausted at a distance...

1. In dim light, pupil becomes large.  2. In bright light, puoil becomes small. 

If we walk from a dark room into sunlight, the pupil of the eye contracts. On again entering the dark room, the pupil of the eye expands.

Examinations sap the examinees of energy and make them sleepless at nights. But then, it has not so far been possible to devise a better way of judging their ability....

In older persons the skin becomes loose as the fat below becomes less with age and the vessels passing through these areas especially on the outside of the hands become...