LIGHT - CIS-Grade10

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

What does reflection mean?

• bending light
• bouncing light

What does refraction mean?

• bending light
• bouncing light

What is this a picture of?

• reflection
• refraction

Focal length of plane mirror is

• At infinity

• Zero

• Negative

• None of these

Image formed by plane mirror is

• Real and erect

• Real and inverted

• Virtual and erect

• Virtual and inverted

A concave mirror gives real, inverted and same size image if the object is placed

• At F

• At infinity

• At C

• Beyond C

A concave mirror gives virtual, refract and enlarged image of the object but image of smaller size than the size of the object is

• At infinity

• Between F and C

• Between P and F

• At E

In optics an object which has higher refractive index is called

• Optically rarer

• Optically denser

• Optical density

• Refractive index

The radius of curvature of a mirror is 20cm the focal length is

• 20 cm

• 10 cm

• 40 cm

• 5 cm