WorksheetsLight
Total questions: 20
Worksheet time: 19mins
The focal length of a concave mirror whose radius of curvature is 32 cm.
16 cm
64 cm
32cm
-16cm
The real image formed by a concave mirror is larger than the object when the object is:
at a distance equal to radius of curvature
at a distance less than the focal length
between focus and centre of curvature
at a distance greater than radius of curvature
The image formed by a concave mirror is virtual, erect and magnified. The position of object is:
at Focus
between focus and centre of curvature
at pole
between pole and focus
The angle of incidence for a ray of light passing through the centre of curvature of a concave mirror is:
45°
90°
0°
180°
The focal length of a small concave mirror is 2.5 cm. In order to use this concave mirror as a dentist's mirror, the distance of tooth from the mirror should be:
2.5 cm
1.5 cm
4.5 cm
3.5 cm
An object is kept at a distance of 5 cm in front of a convex mirror of focal length 10 cm. The position of the image is
3.3cm
3 cm
-3.3 cm
-3 cm
An arrow 2.5 cm high is placed at a distance of 25 cm from a diverging mirror of focal length 20 cm. Size of the image formed is
1 cm
-1 cm
1.1 cm
- 1.1 cm
A convex mirror used as a rear-view mirror in a car has a radius of curvature of 3 m. If a bus is located at a distance of 5 m from this mirror, the nature of the image is
real, erect and same in size.
virtual, erect and same size.
real, erect and smaller in size.
virtual, erect and smaller in size.
An object 20 cm from a spherical mirror gives rise to a virtual image 15 cm behind the mirror. The type of mirror is used
convex
concave
plane
none of these
When a ray of light enters from one medium to another having different optical densities it bends. beacuse
of different optical densities
speed of light changes
obstruction of light changes
frequency of light changes
choose the conditions where light does not bend when entering a medium of different optical density,
incident ray is normal to the refracting surface
any obliquely incident ray
angle of incidence is 90°
angle of incidence is 0°
The quantity which does not changes during refraction is
direction
speed
frequency
wavelength
As a hunter you see a fish in a river. Where should you aim your spear?
Exactly at the fish
Below the fish
Above the fish
Nevermind, you will miss anyway.
In a lens diagram, what does "u" mean?
Object distance
Image distance
Focal Point
Focal Length
