Question

Indicate whether the following statements are true or false.
(a) Two plane mirrors placed at an angle of 60° will produce five images.
(b) As the angle between the mirrors decreases, the number of images formed also decreases.
(c) The turning of a ray of light as it passes from one medium to another is called refraction.
(d) When a ray of light passes from glass to air, the refracted ray moves towards the normal.
(e) A concave lens is a diverging lens.
(f) A convex lens is a diverging lens as rays parallel to the principal axis meet at a point after refraction.
(g) The bottom of a swimming pool seems higher than it actually is because of refraction of light.
(h) A convex lens produces only real images.
(i) The cornea gives colour to the eye.
(j) Vitamin A is essential for good eyesight.
(k) A magnifying glass forms a virtual, inverted image.
(l) Concave lenses bulge outwards, towards the incident light.
(m) A ray of light passing through the focus of a lens is parallel to the axis after refraction.
(n) Long-sighted people always need to wear spectacles.

Answer 1

(a) True

(b) False
As the angle between the mirrors decreases, the number of images formed increases.

[Numbers of images formed, n = (360/Angle between two mirrors) - 1]

(c) True

(d) False
When a ray of light passes from glass to air, the refracted ray moves away from the normal.

(e) True

(f) False
A convex lens is a converging lens, as rays parallel to the principal axis meet at a point after refraction.

(g) True

(h) False
A convex lens may form either a real image or a virtual image depending upon the position of the object.

(i) False
The iris is the coloured part of the eye and the cones allow the eye to see in colour and in bright light.

(j) True

(k) False
A magnifying glass forms a virtual, erect image.

(l) False
Convex lenses bulge outwards towards the incident light.

(m) True

(n) True