Revision Quiz 1

What type of mirror is used in a solar cooker?

• Plane mirror

• Convex mirror

• Concave mirror

• None of these

Which of the following is true for a plane mirror?

• Image is real and inverted

• Image is virtual and erect

• Image is smaller than the object

• Image is formed on the mirror

The image formed by a concave mirror is real, inverted and of the same size as the object when the object is placed at:

• Focus

• Centre of curvature

• Between focus and pole

• Beyond the centre of curvature

The radius of curvature of a mirror is 30 cm. Its focal length is:

• 30 cm

• 15 cm

• 60 cm

• 10 cm

The mirror used by dentists to examine teeth is:

• Convex

• Plane

• Concave

• None of these

Which mirror always forms virtual, erect and diminished images?

• Concave

• Plane

• Convex

• All of these

The phenomenon of bending of light as it passes from one medium to another is called:

• Reflection

• Refraction

• Dispersion

• Diffusion

Refractive index of a medium is given by:

• Speed of light in vacuum × speed in medium

• Speed of light in medium / speed in air

• Speed of light in vacuum / speed of light in medium

• None of these

The unit of refractive index is:

• m/s

• no unit

• m²/s

• candela

A concave lens always forms:

• Real and inverted images

• Virtual and erect images

• Real and erect images

• Enlarged and virtual images