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Where is the aperture on a lens?

Important Questions on Refraction at Spherical Surface and Spherical Lens

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Physics>Optics>Refraction at Spherical Surface and Spherical Lens>Some Basic Definitions in Lens
Write the role of lenses in our daily life.
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Physics>Optics>Refraction at Spherical Surface and Spherical Lens>Some Basic Definitions in Lens
Write the two differences between convex and concave lens.
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Physics>Optics>Refraction at Spherical Surface and Spherical Lens>Some Basic Definitions in Lens
Which type of lens will you apply for reading small letters of a dictionary?
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Physics>Optics>Refraction at Spherical Surface and Spherical Lens>Some Basic Definitions in Lens
A convex lens has a focal length of 15 cm. At what distance should an object be placed in front of the lens to get a real image of the same size of the object?
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Physics>Optics>Refraction at Spherical Surface and Spherical Lens>Some Basic Definitions in Lens
What is a lens? Name the two types of lens.
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Physics>Optics>Refraction at Spherical Surface and Spherical Lens>Some Basic Definitions in Lens

What are the types of spherical lenses? Describe the principal focus, aperture and the optical centre of a spherical lens.

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Physics>Optics>Refraction at Spherical Surface and Spherical Lens>Some Basic Definitions in Lens

Why is a convex lens called a convergent lens?

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Physics>Optics>Refraction at Spherical Surface and Spherical Lens>Some Basic Definitions in Lens
The central point of a lens is known as:
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Physics>Optics>Refraction at Spherical Surface and Spherical Lens>Some Basic Definitions in Lens
Define the focal length of spherical mirror.
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Physics>Optics>Refraction at Spherical Surface and Spherical Lens>Some Basic Definitions in Lens
Define the principal focus of a convex lens.
MEDIUM
Physics>Optics>Refraction at Spherical Surface and Spherical Lens>Some Basic Definitions in Lens

The following diagram shows the use of an optical device to perform an experiment of light.

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As per the arrangement shown, the optical device is likely to be a _____.

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Physics>Optics>Refraction at Spherical Surface and Spherical Lens>Some Basic Definitions in Lens
If the lens is placed in water instead of air, how does its focal length change? 
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Physics>Optics>Refraction at Spherical Surface and Spherical Lens>Some Basic Definitions in Lens

What is meant by the optical centre of a convex lens?

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Physics>Optics>Refraction at Spherical Surface and Spherical Lens>Some Basic Definitions in Lens
Write any three differences between a convex lens and a concave lens.
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Physics>Optics>Refraction at Spherical Surface and Spherical Lens>Some Basic Definitions in Lens
Which lens, thick or thin has greater focal length?
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Physics>Optics>Refraction at Spherical Surface and Spherical Lens>Some Basic Definitions in Lens
Which lens is used for correcting the long-sightedness?
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Physics>Optics>Refraction at Spherical Surface and Spherical Lens>Some Basic Definitions in Lens
Name the piece of transparent materials which have one or two spherical surfaces.
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Physics>Optics>Refraction at Spherical Surface and Spherical Lens>Some Basic Definitions in Lens
With the help of a ray diagram, explain the following terms: optical centre of a convex lens.
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Physics>Optics>Refraction at Spherical Surface and Spherical Lens>Some Basic Definitions in Lens
Which type of lens is used in making telescopes-converging or diverging?
HARD
Physics>Optics>Refraction at Spherical Surface and Spherical Lens>Some Basic Definitions in Lens

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.