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What is the sign convention for the focal length of a convex lens?

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Important Questions on Light Energy

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Science>Physics>Light Energy>Spherical Lenses
An object is placed at 2F of a convex lens. What is the nature and size of the image?
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Science>Physics>Light Energy>Spherical Lenses
What type of image is formed by a concave lens irrespective of object position?
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Science>Physics>Light Energy>Spherical Lenses

Which one of the following factors affects the field of view of a lens?

HARD
Science>Physics>Light Energy>Spherical Lenses
Where does the image form when an object is placed at the focus of a convex lens?
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Science>Physics>Light Energy>Spherical Lenses
What happens to the refractive index of a lens if the medium outside has the same refractive index?
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Science>Physics>Light Energy>Spherical Lenses
What happens to the power of a lens if its focal length is halved?
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Science>Physics>Light Energy>Spherical Lenses
Which phenomenon is responsible for the convergence of light rays in a convex lens?
HARD
Science>Physics>Light Energy>Spherical Lenses
When a plane mirror is placed horizontally on level ground at a distance of 60 m from the foot of a tower, the top of the tower and its image in the mirror subtend an angle of 90° at the corner of the mirror nearer to the foot of tower. The height of the tower is
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Science>Physics>Light Energy>Spherical Lenses
Which type of lens is used to correct myopia?
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Science>Physics>Light Energy>Spherical Lenses
Which lens is used as a magnifying glass?
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Science>Physics>Light Energy>Spherical Lenses
Which of the following statements is true for a concave lens?
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Science>Physics>Light Energy>Spherical Lenses
What is the shape of the image formed by a concave lens when the object is placed at infinity?
EASY
Science>Physics>Light Energy>Spherical Lenses
Which type of lens always forms diminished images?
HARD
Science>Physics>Light Energy>Spherical Lenses
What happens to the focal length of a lens when immersed in water?
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Science>Physics>Light Energy>Spherical Lenses
In optics, the viewable area that can be imaged by a lens system is called the _____.
HARD
Science>Physics>Light Energy>Spherical Lenses
What is the nature of the image formed by a convex lens when the object is between F and the optical center?
EASY
Science>Physics>Light Energy>Spherical Lenses
Cotyledons are also called-
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Science>Physics>Light Energy>Spherical Lenses
What does the term "field of view" describe in the context of a lens system?
EASY
Science>Physics>Light Energy>Spherical Lenses
Which material is commonly used to make lenses?
EASY
Science>Physics>Light Energy>Spherical Lenses
A lens with focal length -15 cm is: