MEDIUM
12th West Bengal Board
IMPORTANT
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Does the focal length of a lens depend on the medium in which the lens is immersed? If so, how? Or, Will the focal length of a lens change if it is immersed in water. If so, how?

Important Questions on Refraction at Spherical Surfaces and Spherical Lens

HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 14 - Refraction at Spherical Surfaces and Spherical Lens>EXERCISE 14>Q 33
A convex lens μ=1.5 is immersed in water μ=1.33. Will the focal length change? If so, how?
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 14 - Refraction at Spherical Surfaces and Spherical Lens>EXERCISE 14>Q 34
What is power of a lens? What is dioptre? How power of a lens is related with refractive index of the material of the lens?
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 14 - Refraction at Spherical Surfaces and Spherical Lens>EXERCISE 14>Q 35
A spherical mirror has a single focal point, but a lens has two focal points. What is the reason of this difference?
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 14 - Refraction at Spherical Surfaces and Spherical Lens>EXERCISE 14>Q 36
By what observations can you decide the nature of the lenses of the two spectacles of powers +2 D and -2 D?
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 14 - Refraction at Spherical Surfaces and Spherical Lens>EXERCISE 14>Q 37

When is the image formed by a convex lens virtual?

deduce the relation for a convex lens producing a virtual image - Physics - TopperLearning.com | d89ffmm

MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 14 - Refraction at Spherical Surfaces and Spherical Lens>EXERCISE 14>Q 40
The focal lengths of a convex lens and a concave mirror are same in air. If the lens and mirror be immersed in water, will their focal lengths change? If not, which one will have greater focal length?
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 14 - Refraction at Spherical Surfaces and Spherical Lens>EXERCISE 14>Q 41
Will the two focal lengths of a lens be equal if the media on two sides of the lens are not the same?
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 14 - Refraction at Spherical Surfaces and Spherical Lens>EXERCISE 14>Q 42
Write the lens maker's formula.