Question Text
Question 2 :
The power of a lens is negative. State whether it is convex or concave?<br/>
Question 3 :
A ray of light strikes the glass slab at an angle of $50^o$. Then the angle of incidence will be _____.
Question 5 :
A object is placed at 30 cm on the principle axis of the convex lens from the lens and an image is formed 60 cm from the lens. If focal length of the lens is 20 cm then calculate the magnification.
Question 6 :
If the angle of incidence is equal to critical angle,then the angle of refractive is ( C ):
Question 7 :
If the angle of incidence is twice the angle of refraction in a medium of refractive index $\mu$, then the angle of incidence is :
Question 8 :
In aerial mapping a camera uses a lens with a $100\ cm$ focal length. The height at which the airplane must fly,so that the photograph of a $1\ km$ long strip on theground fits exactly on the $20\ cm$ long filmstrip of thecamera, is
Question 9 :
The focal length of a thin biconvex lens is 20 cm. when an object is moved from a distance of 25 cm in front of it to 50 cm, the magnification of its image changes from $m_{25}$ to $m_{50}$. The ratio of $m_{25}$ to $m_{50}$ is :
Question 10 :
The angle between the incident ray and the normal is called ________.<br>
