List of top Physics Questions on Optics

The magnitudes of power of a biconvex lens (refractive index \(1.5\)) and that of a plano-convex lens (refractive index \(1.7\)) are same. If the curvature of the plano-convex lens exactly matches with the curvature of the back surface of the biconvex lens, then the ratio of radii of curvature of the front and back surfaces of the biconvex lens is:

The strain-stress plot for materials A, B, C and D is shown in the figure. Which material has the largest Young's modulus? 

Some distant star is to be observed by some telescope of diameter of objective lens \(a\), at an angular resolution of \(3.0 \times 10^{-7}\) radian. If the wavelength of light from the star reaching the telescope is 500 nm, the minimum diameter of the objective lens of the telescope is ________ cm.
A compound microscope is designed with two symmetric biconvex lenses. The objective lens is cut vertically, creating two identical plano-convex lenses. One of them is used in place of original objective lens. To retain same magnification keeping the object distance unchanged, the tube length has to be:
A telescope with objective diameter \(R\) is used to observe a distant star emitting light of wavelength 500 nm, at a resolution of \(5 \times 10^{-7}\) radian. The value of \(R\) is ________ cm.
In a YDSE experiment, a sheet of thickness \( t \) and \( \mu = 1.56 \) is introduced at a slit. The central maxima shifts to the position of the \( 7^{\text{th}} \) maxima. The wavelength of light is 480 nm. If \( t = x \, \mu\text{m} \), find the value of \( x \).

As shown in the figure, for a biconvex lens the focal length is \( f \) and both radii of curvature are \( R \). Find the value of \( f/R \) (\( \mu = 1.4 \)): 

Total energy of Hydrogen like species is given as -54.4 eV/atom. The value of 'n' and 'Z' respectively are :
A block of mass 1 kg moving with velocity varies according to position as \( v = 2x^2 \). If the block goes from \( x = 0 \) to \( x = 5 \), find the work done by the block.
Which of the following is correct outputs for inputs (1, 1) and (0, 1)?
If error in diameter of a sphere is 2%, then find error in volume of the sphere.

Find the distance of the final image from the second lens. Given \(f_1 = 10\,\text{cm}\), \(f_2 = 15\,\text{cm}\). The object is placed \(15\,\text{cm}\) to the left of the first lens and the separation between the lenses is \(15\,\text{cm}\). 

A thin convex lens and a thin concave lens are kept coaxially in contact. Choose the correct option.
In a YDSE setup slit separation is \(d = 5\lambda\), where \(\lambda\) is wavelength of light and screen is placed at distance \(D = 10d\). If maximum intensity is \(I_0\), find intensity at a point directly in front of one of the slit.

Thin symmetric prism of $\mu = 1.5$. Find ratio of incident angle and minimum deviation.


 

Find the length of image of rod \(AB\). The rod is placed in front of a concave mirror of focal length \(f = 10\,\text{cm}\). End \(A\) is \(20\,\text{cm}\) from the mirror and the length \(AB = 10\,\text{cm}\).
A slit of width \(a\) is illuminated by light of wavelength \(\lambda\). The linear separation between the 1st and 3rd minima in the diffraction pattern produced on a screen placed at a distance \(D\) from the slit is:
Resolving power of a telescope is \(5\times10^{-7}\,\text{rad}\). If wavelength of incident light is \(500\,\text{nm}\), find the diameter of the aperture of the telescope.
Angular momentum of the electron in a hydrogen atom is $\frac{3h}{2\pi}$, then find the energy of the electron in the orbit :-
If speed of light is \(2.12\times10^8\,\text{m/s}\) in the medium of an equilateral prism, find the minimum angle of deviation.
In a compound microscope objective and eyepiece are both biconvex lenses of focal length \(f_0\). If objective lens is cut into two halves such that a plano–convex lens is made and now it is used as objective to get same magnification, by how many times should the tube length be changed?
In YDSE, \(\beta = 2.4\) mm where \(\beta\) is fringe width. If the setup is dipped in a medium of refractive index \(\mu = 1.2\), find the new fringe width (in mm).

Speed of light in the prism is \( 2 \times 10^8 \, \text{m/s} \). Find the minimum deviation through the prism shown below. 


 

A rod is placed along the principal axis as shown. Find the length of the image. The focal length of the mirror is \(f = 10\,\text{cm}\).
There is a thin layer of refractive index \( \mu \) below the base of an equilateral prism. The path of a ray is shown in the figure. Find out \( \mu \).