Question 1 :
The power of a lens having a focal length of $1\;cm$ is :
Question 2 :
Identify the phenomenon due to which a converging lens forms an image :
Question 3 :
A beam of light passing from air enters into the glass. Identify which of the following statements is true?<br/>
Question 5 :
$ \dfrac{\sin i}{\sin r}  =$constant, the value of constant depends upon<br/>a) Pair of media <br/>b) Color of incident light<br/>c) Wave length <br/>d) Refracting nature of material<br/>
Question 6 :
The ratio of the sine of angle  of incidence to the sine of angle of refraction is a constant for :
Question 7 :
The focal length of a concave lens is $2m$. Then the power of the lens is:<br/>
Question 8 :
When light goes from a denser to a rarer medium the angle of refraction is:
Question 10 :
If the power of a lens is $0.1\;D$, its focal length is
Question 11 :
When light passes from one medium to another, the physical quantity that remains unchanged is
Question 13 :
A converging lens has a focal length of 100 cm.The power of this lens is
Question 14 :
Two thin lenses of focal lengths $20 cm$ and $25 cm$ are placed in contact. The effective power of the combination is
Question 15 :
In the displacement method, a convex lens is placed in between an object and a screen. If one of the magnification is $3$ and the displacement of the lens between the two positions is $24$cm, then the focal length of the lens is:
Question 16 :
A concave mirror is made from a hollow sphere of radius of curvature 30 cm.  If an object of height 2 cm is placed at 10 cm from the pole of the mirror, determine the size of the image :
Question 17 :
An object is placed at $30$ cm distance from a concave mirror of focal length $20$ cm, then nature, magnification of the image will be:
Question 18 :
The distance between an object and its doubly magnified image by a concave mirror is: [ Assume $f$ = focal length]
