Question 1 :
Which of the following is not a characteristic of image formed by Concave lens ?

Question 3 :
A plane glass plate is placed over a various coloured letters (violet, green, yellow, red). The letter which appears to raised more

Question 4 :
When a ray of light passes through a rectangular glass slab, the angle of emergence

Question 5 :
When light goes from a denser to a rarer medium the angle of refraction is:

Question 6 :
A double convex lens of glass of $\mu_1.5$ has radius of curvature of each of its surface is $0.2\ m$. The power of the lens is

Question 7 :
What is the minimum and maximum distance between the convex lens and the object for the magnification of a real image to be greater than 1.?

Question 8 :
If two $+5D$ lenses are mounted at some distance apart, the equivalent power will always be negative if the distance is

Question 9 :
If linear magnification for a spherical mirror is $\dfrac{3}{2}$, then we may write: (symbols have their usual meanings) 

Question 10 :
An object is placed on the principal axis of a concave mirror at a distance of 60 cm. If thefocal length of the concave mirror is 40 cm then determine the magnification of the obtainedimage.

Question 11 :
Air has refractive index $1.0003$. Find the thickness of air column which will contain one more wavelength of yellow light of $6000$ $A^0$ than in same thickness of vacuum.

Question 12 :
When a light of wavelength $4000$ $\displaystyle \overset { \circ  }{ A } $ in vacuum travels through the same thickness in diamond and water separately, the difference in the number of waves is $200$. Find the thickness, if refractive indices of diamond and water are $\displaystyle \frac { 5 }{ 2 } $ and $\displaystyle \frac { 4 }{ 3 } $ respectively.

Question 13 :
An image of a bright square is obtained on a screen with the aid of a convergent lens. The distance between the square and the lens is $40\ cm$. The area of the image is nine times larger than that of the square. Select the correct statement(s).

Question 14 :
Three convex lenses are available having focal lengths of $4 cm, 40 cm$ and $4 m$ respectively. Which one could be used as magnifying glass?