Farhan’s classroom is very close to the compound wall of his school. He was observing two pigeons sitting on the wall. He could see one bird clearly, but the image of the second bird was blurred as the pigeon was a little away from the first.

(a) Name the defect of the eye Farhan is suffering from.

(b) Where is the image of the second pigeon formed in his eyeballs?

(c) What lens can be used to correct the defect?

Which parts of the ear are responsible for:

(a) Static equilibrium?

(b) Dynamic equilibrium?

Chris was watching the display of fireworks in the sky.

(a) Trace the path of the light rays using the following terms:

Fovea, Lens, Conjunctiva, Pupil, Cornea

(b) Name the nerve that carries the impulse for vision to the brain.

Keshav enters a dark room from a brightly lit area. He experiences difficulty in viewing objects, but gradually his vision improves.

Explain the role of the photoreceptors in this case.