Physics Project Report on Polarisation of Light Class 12 CBSE.
Physics Cheat Sheet - LIGHT and MATTER
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This document covers some of the important points to be kept in mind for CBSE class 10 physics chapter - Light, Reflection and Refraction such as how to take care of the sign conventions which most...
Light From Light
There are 5 different questions and corresponding answers in the main field of solid state physics.
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Physics Practice Questions
Q1.
For the same angle of incidence 45 degree, the angle of refraction in two transparent media 1 and 2 is 20 degree and 30 degree respectively. out of 1and 2 which is optically denser medium and why ?
Q2.
For the same angle of incidence in media p , q , r the angles angles of refraction are 45 , 35 and 15 degrees respectively. In which medium will the velocity of light be minimum?
Q3.
For what angle of incidence, the lateral shift produced by parallel sided glass plate is zero?
Q4.
What are the factors on which the lateral shift depends?
Q5.
A coin in a glass beaker appears to rise as the beaker is slowly filled filled with water. Why?
Q6.
An object under water appears to be at lesser depth than in reality. Explain why?
Q7.
Why does bending of light takesplace?
Q8.
Does the refractive index of substance change with the colour of light ?
Q9.
What is the advantage of "total internal reflection" over reflection ?
Q10
.In refraction refraction of light through a rectangular rectangular glass slab, the emergent ray is parallel to the the direction of the incident ray. Why
Q11.
Under what what condition condition in an arrangement arrangement of two plane mirrors, incident ray and and reflected reflected ray will always be parallel to each other, whatever may be angle of incidence.
Q12.
Define the principal focus of a concave mirror.
Q13.
The radius radius of curvature of a spherical spherical mirror is 20 cm. What is its focal length?
Q14.
Why do we prefer a convex convex mirror as a rear-view rear-view mirror in vehicles?
Q15.
A concave concave mirror produces three times magnified (enlarged) real image of object object placed at 10 cm in front of it. Where is the image located?
Q16.
A ray of light travelling in air enters obliquely into water. Does the the light ray bend towards towards the normal or away from the normal? Why?
Q 17.
Light enters enters from air to to glass having refractive refractive index 1.50. What is the speed speed of light in the 8 glass? The speed of light in vacuum is 3 × 10 m/s.
Q18.
Find out, from from Table (see NCERT Book), the medium having highest optical density. Also find the medium with lowest optical density.
Q19.
You are given kerosene, kerosene, turpentine turpentine and and water. water. In which of these does the the light light travel travel fastest? Use the information given in Table (see NCERT Book)
Q20.
The refractive refractive index of diamond is 2.42. What is is the the meaning meaning of this statement? statement?
Q21.
Define 1 dioptre of power of a lens.
Q22.
A convex lens forms forms a real and and inverted image of of a needle at a distance distance of 50 cm From From it. Where is the needle placed in front of the convex lens if the image is equal to the size of the object? Also, find the power of the lens.
Q23.
Find the power of a concave lens of focal length 2 m.
Q24.
The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object?
Q25.
Where an object should is placed in front of a convex lens to get a real image of the size of the object?
Q26.
A spherical mirror and a thin spherical lens have each a focal length of -15 cm. The mirror and the lens are likely to be------------
Human eye and colourful world
Q1.
A man can read the number of a distant bus clearly but he finds difficulty in reading a book. Which defect of the eye is he suffering from? What type of spec tacles lens should be used to correct the defect?
Q2.
What type of spectacles should be worn by a person having the defects of myopia as well as hypermetropia? How does it help?
Q3.
The sun near the horizon appears flattened at the sun set and sun rise. Explain why.
Q4.
Explain why and when the sun is overhead at noon it appears white
Q5.
A boy uses spectacles of focal length -50 cm. Name the defect of vision he is suffering from. Compute the power of this lens.
Q6.
Give the meaning of the term ‚ VIBGYOR‛ with which phenomenon is it connected?
Q7.
Explain the following terms connected with the eye. (i) Ciliary muscles (ii) Accommodation.
Q8.
What is meant by spectrum of white light?
Q9.
(a) What will be color of the sky in the absence of atmosphere? (b) Why are the traffic light signals (or danger signals) of red color?
Q10.
Why does the sky appear dark and black to an astronaut instead of blue?
Q12.
What is Atmospheric Refraction?
Q13.
Describe: Mirage and looming
Q14.
A person with myopic eye cannot see objects beyond 1.2metre distinctly. What should be the nature of corrective lenses to restore proper vision?
Q15.
The far point of myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to enable him to see very distant objects distinctly?
Q16.
The far point of a myopic person is 150 cm in front the eye. Calculate the focal length and power of a lens required to enable him to see distant objects clear ly.
