Light---Reflection and Refraction

A real image is formed by the light rays after reflection or refraction when they:

(A) actually meet or intersect with each other.

(B) actually converge at a point.

(C) appear to meet when they are produced in the backward direction.

(D) appear to diverge from a point.

Which of the above statements are correct?

• (A) and (D)

• (B) and (D)

• (A) and (B)

• (B) and (C)

Consider the following properties of virtual images:

(A) cannot be projected on the screen

(B) are formed by both concave and convex lens

(C) are always erect

(D) are always inverted

The correct properties are:

• (A) and (D)

• (A) and (B)

• (A), (B) and (C)

• (A), (B) and (D)

Which of the following ray diagrams is correct for the ray of light incident on a concave mirror as shown in Fig. ?

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The object distance u, image distance v and focal length f for a spherical mirror are related as

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The image formed by a convex mirror is always

• real and magnified

• real and diminished

• virtual and diminished

• virtual and magnified.

Under which of the following conditions a concave mirror can form an image larger than the actual object?

• When the object is kept at a distance equal to its radius of curvature

• When object is kept at a distance less than its focal length

• When object is placed between the focus and centre of curvature

• When object is kept at a distance greater than its radius of curvature

When an object is kept within the focus of a concave mirror, an enlarged image is formed behind the mirror. The image is:

• real

• inverted

• virtual and inverted

• virtual and erect

An object is placed at a distance of 30 cm from a concave mirror of focal length 15 cm. The image will be

• real and of same size

• real and magnified

• real and diminished

• virtual and magnified

Starting from a large distance, a flame is moved towards a convex mirror. Then the image

• decreases in size and moves towards pole

• increases in size and moves towards pole

• decreases in size and moves away from pole

• increases in size and moves away from pole.

Magnification produced by a rear view mirror fitted in vehicles

• is less than one

• is more than one

• is equal to one

• can be more than or less than one depending upon the position of the object in front of it