Reflection

When light falls on a smooth polished surface, most of it

• (a) is reflected in the same direction

• (b) is reflected in different directions

• (c) is scattered

• (d) is refracted into the second medium

Image formed by reflection from a plane mirror is

• (a) real and inverted

• (b) virtual and erect

• (c) real and erect

• (d) virtual and inverted

A point object is placed at a distance of 20 cm from a convex mirror of focal length 20 cm. The image will form at:

• (a) at infinity

• (b) at focus

• (c) at the pole

• (d) behind the mirror

An object is placed at a distance of 0.25 m in front of a plane mirror. The distance between the object and image will be

• (a) 0.25 m

• (b) 1.0 m

• (c) 0.5 m

• (d) 0.125 m

The nature of the image formed by concave mirror when the object is placed between the focus (F) and centre of curvature (C) of the mirror observed by us is

• (a) real, inverted and diminished

• (b) virtual, erect and smaller in size

• (c) real, inverted and enlarged

• (d) virtual, upright and enlarged

25. A10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is [NCERT Exemplar Problems]

• (a) – 30 cm

• (b) – 20 cm

• (c) – 40 cm

• (d) – 60 cm