Adjusting the focal length of the eye lens to view objects at different distances is done by:

1. Cornea
2. Iris
3. Ciliary muscles
4. Sclera

The ear ossicle that transports sound vibrations to the inner ear:

1. Stapes
2. Malleus
3. Incus
4. Cochlea

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.