Question

1. the amount of light entering the eye is controlled by the;
a. pupil
b. ciliary muscle
c. iris
d. cornea

2. concave mirror gives a real,, point sized image at focus, when object is placed at;
a. at focus
b.bw f1 and 2f
c. at infinity
d. at 2f

Answer 1

Answer:

1

a. pupil

The iris opens and closes to control the amount of light entering the eye through the pupil. The pupil is the opening in the center of the iris where light enters the eye. When looking at the eye, the pupil appears black.

2

a)

A virtual, erect and enlarged image is formed at the same side of lens, when an object is placed between principal focus, F1 and optical centre, O of a convex lens. Properties of Image: Image is enlarged, virtual and erect.

Answer 2

Answer:

1. The amount of light entering the eye is controlled by the pupil

as the pupil is the opening in the center of the iris where light enters the eye.

2. Concave mirror gives a real,, point sized image at focus, when object is placed at focus

When the object is that the focal point, the image is at infinity. As the object moves towards the mirror inside the focal point the image becomes virtual and upright behind the mirror.