EASY
12th West Bengal Board
IMPORTANT
Earn 100

Describe briefly the principle of operation of a totally reflecting prism.

Important Questions on Refraction of Light

MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 13 - Refraction of Light>EXERCISE 13>Q 12
What is the angle of minimum deviation? Obtain an expression for the refractive index of the material of a prism in terms of the refracting angle of the prism and the angle of minimum deviation.
HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 13 - Refraction of Light>EXERCISE 13>Q 13
Draw a diagram showing a ray of light incident on a thick prism, refracted through it and emergent out of it. Show that 𝛿=i+i'-A and A=r+r'.[Symbols have their usual meaning]. Show in the above diagram that for angle of incidence i or i' deviation 𝛿 remains the same.
HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 13 - Refraction of Light>EXERCISE 13>Q 14
Show the nature of the i-𝛿 curve for a prism. Analyse the curve to show that for any particular value of 𝛿, the difference between the fixed values of i and e decrease with the decrease of 𝛿 and becomes zero for 𝛿 minimum.
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 13 - Refraction of Light>EXERCISE 13>Q 15
Show that for a prism whose refracting angle (A) is greater than twice the critical angle θc between the material of the prism and the outside medium, a ray incident at one face will not emerge from the other face, whatever may be the angle of incidence.
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 13 - Refraction of Light>EXERCISE 13>Q 16
Show that for refraction through a glass prism of refracting angle A, angle of deviation is given by D=i2+i2-A where i1 and i2 are angles of incidence and emergence respectively. Show that D does not depend on the angle of incidence for a very thin prism.
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 13 - Refraction of Light>EXERCISE 13>Q 1
The R.I of water with respect to air is 1.33 and that of an oil with respect to air is 1.45. What is the R.I of oil with respect to water and of water with respect to oil?
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 13 - Refraction of Light>EXERCISE 13>Q 2
Refractive index of glass is 1.5 and that of water is 1.33. If the velocity of light in glass be 2×108 ms-1 what is the velocity of light in water?
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 13 - Refraction of Light>EXERCISE 13>Q 3
A glass hemisphere of radius 4 cm and r.i. 1.6 is placed centrally over a cross-mark on a paper (i) with flat surface