LIGHT REFLECTION AND REFRACTION (10th CBSE) PHYSICS

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

Which of the following can make a parallel beam of light when light from a point source is incident on it?

• (a) Concave mirror as well as convex lens

• (d) Concave mirror as well as concave lens

• (b) Convex mirror as well as concave lens

• c) Two plane mirrors placed at 90° to each other

A 10 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

• 30cm

• 20cm

• 60cm

• 40cm

Which of the following statements is true?

• A convex lens has 4 dioptre power having a focal length 0.25 m

• A convex lens has –4 dioptre power having a focal length 0.25 m

• A concave lens has –4 dioptre power having a focal length 0.25 m

• A concave lens has 4 dioptre power having a focal length 0.25 m

A beam of light is incident through the holes on side A and emerges out of the holes on the other face of the box as shown in the Figure 10.4. Which of the following could be inside the box?

• concave lens

• rectangular glass slab

• prism

• convex lens

You are given water, mustard oil, glycerine and kerosene. In which of these media a ray of light incident obliquely at same angle would bend the most

• kerosene

• water

• mustard

• glycerine

The path of a ray of light coming from air

passing through a rectangular glass slab

traced by four students are shown as A,

B, C and D in Figure 10.5. Which one of

them is correct?

• 
• 
• 
• 

shows a ray of light as it travels from medium A to medium B. Refractive index of the medium B relative to medium A is

• √3 / √2

• √2 / √3

• 1/ √2

• √2

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

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

  curvature

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

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

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

  curvature

Beams of light are incident through the holes

A and B and emerge out of box through the

holes C and D respectively as shown in the Which of the following could be inside the box?

• prism

• rectangular glass slab

• convex lens

• concave lens