State whether the following statements are true or false. Rewrite the false statements correctly.
(a) The laws of reflection hold good only for plane mirrors and not for spherical mirrors.
(b) The radius of curvature is double the focal length of a concave mirror.
(c) A ray passing through the focus cuts through the principal axis of a concave mirror after reflection.
(d) When an object is placed between a concave mirror and its focus, the image formed is virtual, erect and larger than the object.
(e) The image formed on a cinema screen is virtual.
(f) A convex mirror is used by stage artists.
(g) A convex mirror always gives real images.
(h) A pinhole camera gives a real image.
(i) A convex surface bulges inwards.
(j) Incident rays parallel to the principal axis of a curved mirror pass through the focus after reflection.
(k) A concave mirror always forms a real image.
(l) There can be many reflected rays for a single incident ray falling on a reflecting surface.

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Solution

(a) False.
The laws of reflection of light apply to all mirrors including plane and spherical mirrors.

(b) True.

(c) False.
A ray passing through the focus of a concave mirror becomes parallel to the principal axis after reflection.

(d) True.

(e) False.
The image formed on a cinema screen is real.

(f) False.
A concave mirror is used by stage artists.

(g) False.
A convex mirror always forms virtual image.

(h) True.

(i) False.
A convex surface bulges outwards.

(j)True.

(k) False.
In a concave mirror, the image formed can be either real or virtual.

(l) False.
For one incident ray, there is only one reflected ray.

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Similar questions

An incident ray which passes through the principal focus, after reflection on a concave mirror, emerges.....................

Write True or false for each statement :

(a) Water is optically denser than glass.

(b) A ray of light when passes from glass to air, bends towards the normal.

(d) The depth of a pond when seen from above appears to be less.

(e) Light travels at a lower speed in water than in air.

(f) Light travels in the same straight line path while passing through different media.

(g) The angle formed between the normal and the refracted ray is known as the angle of incidence.

(h) At the point of incidence, a line drawn at right angles to the surface, separating the two media, is called the normal.

(i) Image is formed by a mirror due to refraction of light.

(j) Rays of light incident parallel to the principal axis pass through the focus after reflection from a concave mirror.

(k) A convex mirror is used as a shaving mirror.

(l) The focal length of a convex mirror is equal to its adius of curvature.

(m) A concave mirror converges the light rays, but a convex mirror diverges them.

(n) A virtual image formed by a spherical mirror is always erect and situated behind the mirror.

Ans. True - (d), (e), (h), (j), (m), (n),

False - (a), (b), (c), (f), (g), (i), (k), (l)

Use the mirror equation to deduce that:

(a) an object placed between f and 2f of a concave mirror produces a real image beyond 2f.

(b) a convex mirror always produces a virtual image independent of the location of the object.

(c) the virtual image produced by a convex mirror is always diminished in size and is located between the focus and the pole.

(d) an object placed between the pole and focus of a concave mirror produces a virtual and enlarged image.

[Note: This exercise helps you deduce algebraically properties of

images that one obtains from explicit ray diagrams.]

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