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Is the focus of a concave lens negative?

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
Which one of the following materials cannot be used to make a lens?
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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
_____ lenses are thicker in the middle than at the edges.
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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
_____ lens is used in a camera.
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Science>Physics>Refraction of Light>Spherical Lenses
Which of the following lenses would you prefer to use while reading small letters found in a dictionary? 
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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
_____ is a point at which all rays meet after reflecting from the curved surface of the spherical mirrors.
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Science>Physics>Refraction of Light>Spherical Lenses
A ray of light continues to move in same direction even after refraction through a lens. It means that the ray passes through the _____ of the lens.
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Science>Physics>Refraction of Light>Spherical Lenses

_____(5/6) images of himself can an observer see in a room whose ceiling and two adjacent walls are mirrors?

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Science>Physics>Refraction of Light>Spherical Lenses
The central point of a lens is its _____.
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Science>Physics>Refraction of Light>Spherical Lenses
_____ lens is a 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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Science>Physics>Refraction of Light>Spherical Lenses
A concave lens is also known as _____ (converging lens / diverging lens).
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Science>Physics>Refraction of Light>Spherical Lenses

_____is the S.I unit of power of  a lens.

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Science>Physics>Refraction of Light>Spherical Lenses

A point inside the lens through which light passes without any deviation is called _____.

(centre of curvature/ optical centre)

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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
The point of the lens through which the light goes undeviated after refraction is known as _____.