Test Details

Ray Optics and Optical Instruments

Don't Cheat

Jan 18, 10:00 AM

120 minutes

Jan 18, 12:00 PM

40.0 marks

MCQ

20 questions

EduHub

Hey there. EduHub after being established by Mr. Anuj Kimothi in 2016 in Pauri has consistently been the first choice of students. We teach PCM to students from 9th to 12th and those preparing for JEE, KVPY and other competitive exams.

Class Details

Physics

Physics Class 12

Physics

This class basically aims at clearing the concepts of Physics. The format used is simple and illustrative. The class is bilingual.

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Question Text

Question 1 :
A biconvex lens with equal radii curvature has refractive index $1.6$ and focal length $10\ cm$. Its radius of curvature will be

Question 2 :
In an experiment to trace the path of a ray of light through a glass prism for different values of angle of incidence a student would find that the emergent ray:

Question 3 :
A real image occurs when rays converge. A virtual image occurs when rays

Question 4 :
According to Snell's Law of refraction, the ratio of the refractive index is related to the inverse ratio of the ____ of the angles.<br/>

Question 5 :
The first law of refraction states that the incident and refracted rays are in the same ________ as the normal.

Question 6 :
If the wavelength of the light be $\lambda$, the wavelength in a medium of refractive index $n$ will be

Question 8 :
The focal length of a glass slab of refractive index $1.5$ is

Question 10 :
If the focal length of the objective lens is increased then 

Question 11 :
The focal length of the objective of a telescope is $60$ cm. To obtain a magnification of $20$ for the relaxed eye, the length of telescope should be

Question 12 :
A bubble in glass slab $(\mu = 1.5)$ when viewedfrom one side appears at $5 \ cm$ and $2 \ cm$ fromother side, then thickness of slab is :

Question 13 :
Assertion: If light enters from medium-1 into medium-2 and bends towards the normal, its wavelength in medium-2 is smaller than its wavelength in medium-1 Reason: According to Cauchy's relation, $\mu = A + \dfrac{B}{\lambda^2}$

Question 14 :
A ray of monochromatic light is incident on the refracting face of a prism (angle $75^{\circ}$ It passes through the prism and is incident on the other face at the critical angle. If the refractive index of the prism is $\sqrt {2}$, then the angle of incidence on the first face of the prism is

Question 15 :
Chromatic aberration(distance between the focal lengths for extreme wavelengths) of a convex lens can be reduced by(Assume lenses are kept in vacuum)<br>

Question 16 :
Two thin lenses of power $+3.5D, -2D$ are placed in contact. Find the power of lens combination.

Question 17 :
A thin bi-convex lens of focal length $20\ cm$ is made of glass of refractive index $1.5$. When it is dipped in a liquid of refractive index $\displaystyle \frac { 9 }{ 8 } $, it acts as a:

Question 18 :
An object $2.4\ m$ in front of a lens forms a sharp image on a film $12\ cm$ behind the lens. A glass plate $1\ cm$ thick of refractive index $1.50$ is interposed between lens and film with its plane faces parallel to film. At what distance (from lens) should object be shifted to be in sharp focus on film?

Question 19 :
An object of length $2\ cm$ is placed at distance $1.5f$ from a concave mirror where $'f'$ is its focal length. Find the length of the image.

Question 20 :
Two lenses of power +10 D and -5 D are placed in contact. Where should a object be held from the lens, so as to obtain a virtual image of magnification 2?

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