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What is the focus of concave lens?

Important Questions on Refraction of Light

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Science>Physics>Refraction of Light>Spherical Lenses
Which lens, thick or thin has greater focal length?
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Science>Physics>Refraction of Light>Spherical Lenses
If the lens is placed in water instead of air, how does its focal length change? 
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Science>Physics>Refraction of Light>Spherical Lenses
A concave lens is also known as _____ (converging lens / diverging lens).
HARD
Science>Physics>Refraction of Light>Spherical Lenses

A beam of light is incident through the holes on side A and emerges out of the holes on the other face of the box as shown in figure. Which of the following could be inside the box?
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MEDIUM
Science>Physics>Refraction of Light>Spherical Lenses
Differentiate between the first focal length of concave and convex lens.
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Science>Physics>Refraction of Light>Spherical Lenses
The distance between the optical centre and the principal focus of a lens is called its _____.
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Science>Physics>Refraction of Light>Spherical Lenses
What are the terms related to spherical lenses?
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Science>Physics>Refraction of Light>Spherical Lenses
The line joining the centre of curvature of two surfaces of a lens is called its _____. (optical axis/aperture)
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Science>Physics>Refraction of Light>Spherical Lenses
The distance between the optical centre and the principal focus of the lens is called its _____.
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Science>Physics>Refraction of Light>Spherical Lenses
Mention the uses of convex lenses.
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Science>Physics>Refraction of Light>Spherical Lenses

Distinguish between:

Concave lens and Convex Lens

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Science>Physics>Refraction of Light>Spherical Lenses
Can you measure approximate focal length of concave lens?
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Science>Physics>Refraction of Light>Spherical Lenses

The centre of the lens is _____.

(Choose from the following: centre of curvature/optical centre)

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Science>Physics>Refraction of Light>Spherical Lenses
Differentiate between the types of lens.
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Science>Physics>Refraction of Light>Spherical Lenses
The point of the lens through which the light goes undeviated after refraction is known as _____.
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Science>Physics>Refraction of Light>Spherical Lenses

A convex lens is distinguished from a concave lens by the property of 

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Science>Physics>Refraction of Light>Spherical Lenses
Which one of the following materials cannot be used to make a lens?
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Science>Physics>Refraction of Light>Spherical Lenses
Define lens and its types.
HARD
Science>Physics>Refraction of Light>Spherical Lenses

How will the following be affected on cutting lens into two equal halves along the principal axis?

(a) focal length

(b) intensity of image formed by half lens.

EASY
Science>Physics>Refraction of Light>Spherical Lenses

Each lens has a point, a ray passing through it goes without deviation. What is the name of that point and where is it located?