GRADE-10 - PHYSICS

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

• 0.25 m

• 1.0 m

• 0.5 m

• 0.5

The angle of incidence for a ray of light having zero reflection angle is

• 0

• 30 degree

• 45 degree

• 90 degree

For a real object,which of the following can produce a real image

• plane mirror

• concave mirror

• concave lens

• convex mirror

Which of the following mirror is used by a dentist to examine a small cavity

• convex mirror

• plane mirror

• concave mirror

• combination of convex and concave mirror

Tags

NGSS.MS-PS4-2

Which one of the following materials cannot be used to make a lens

• glass

• plastic

• clay

Find the focal length of a lens of power -2.0 D

• - 0.5m

• 0.5m

• -0.2m

• 0.2m

where should an object be placed in front of a convex lens to get a real image of the size of the object

• at the principal focus of the lens

• at twice the focal length

• at infinity

• between the optical center of the lens and it's principal focus.

Speed of light in vaccum

• 3 x 10^9 m/s

• 3 x 10^8 m/s

• 3 x 10^8 ms

• 2 x 10^8 ms

Tags

NGSS.HS-PS4-1

Find the focal length of lens for power = +1.5 D

• 0.55 m

• 0.66 m

• 0.25 m

• 0.15 m

A double concave lens is simply called a

• convex lens

• lens

• concave lens

• concave mirror