Refraction of Refraction - Maharashtra Board STD 10 Science Questions

Q 1M.C.Q1 Mark

A convex lens has a focal length of $10\ cm.$ At which of the following position should an object be placed so that this convex lens may act as a magnifying glass?

✓
$15\ cm$
B
$7\ cm$
C
$20\ cm$
D
$25\ cm $

Answer: A.

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Q 2M.C.Q1 Mark

A lens of focal length $12\ cm$ forms an erect image three times the size of the object. The distance between the object and image is:

A
$8\ cm$
✓
$16\ cm$
C
$24\ cm$
D
$36\ cm$

Answer: B.

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Q 3M.C.Q1 Mark

An object is $0.09m$ from a magnifying lens and the image is formed $36\ cm$ from the lens. The magnification produced is:

A
$0.4$
B
$1.4$
✓
$4.0$
D
$4.5$

Answer: C.

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Q 4M.C.Q1 Mark

The power of a converging lens is $4.5D$ and that of a diverging lens is $3D.$ The power of this combination of lenses placed close together is:

A
$+1.5D$
B
$+7.5D$
C
$-7.5D$
✓
$-1.5D$

Answer: D.

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Q 5M.C.Q1 Mark

Only one of the following applies to a concave lens. This is:

A
Focal length is positive.
B
Image distance can be positive or negative.
C
Height of image can be positive or negative.
✓
Image distance is always negative.

Answer: D.

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Q 6Answer the following questions:[1 M]1 Mark

A beam of light travelling in a rectangular glass slab emerges into air. Draw a ray-diagram indicating the change in its path.

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Q 7Answer the following questions:[1 M]1 Mark

A ray of light goes from water into air. Will it bend towards the normal or away from the normal?

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Q 8Answer the following questions:[1 M]1 Mark

Which of the two has a greater power:
A lens of short focal length or a lens of large focal length?

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Q 9Answer the following questions:[1 M]1 Mark

What is the nature of the image formed by a convex lens if the magnification produced by the lens is +3?

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Q 10Answer the following questions:[1 M]1 Mark

Where should an object be placed in front of a convex lens so as to obtain its real, inverted and magnified image?

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Q 11Answer the following questions: [2 M]2 Marks

A lens has a focal length of, -10cm. What is the power of the lens and what is its nature?

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Q 12Answer the following questions: [2 M]2 Marks

List some things that convex lens and concave mirror have in common.

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Q 13Answer the following questions: [2 M]2 Marks

What is the position of image when an object is placed at a distance of 10cm from a convex lens of focal length 10cm?

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Q 14Answer the following questions: [2 M]2 Marks

An object is placed at the following distance from a convex lens of focal length 15cm:

35cm
30cm
20cm
10cm

Which position of the object will produce:

A magnified real image?
A magnified virtual image?
A diminished real image?
An image of same size as the object?

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Q 15Answer the following questions: [2 M]2 Marks

A doctor has prescribed a corrective lens of power, -1.5D. Find the focal length of the lens. Is the prescribed lens diverging or converging?

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Q 16Answer the following questions: [3 M]3 Marks

Which type of lens is:

A converging lens, and which is.
A diverging lens? Explain your answer with diagrams.

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Q 17Answer the following questions: [3 M]3 Marks

With the help of a labelled diagram, explain why a tank full of water appears less deep than it actually is.

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Q 18Answer the following questions: [3 M]3 Marks

A concave lens has focal length 15cm. At what distance should the object from the lens be placed so that it forms an image at 10cm from the lens? Also find the magnification produced by the lens.

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Q 19Answer the following questions: [3 M]3 Marks

A concave lens of 20cm focal length forms an image 15cm from the lens. Compute the object distance.

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Q 20Answer the following questions: [3 M]3 Marks

The optical prescription for a pair of spectacles is:
Right eye: 3.50D, Left eye: 4.00D

Are these lenses thinner at the middle or at the edges?
Which lens has a greater focal length?
Which is the weaker eye?

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Q 21Answer the following questions: [5 M]5 Marks

The speed of light in vacuum and in two different glasses is given in the table below:

Medium	Speed of light
Vacuum Flint glass Crown glass	$3.00 \times 10^8m/ s$ $1.86 \times 10^8m/ s$ $1.97 \times 10^8m/ s$

Calculate the absolute refractive indexes of flint glass and crown glass.
Calculate the relative refractive index for light going from crown glass to flint glass.

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Q 22Answer the following questions: [5 M]5 Marks

An object is placed 10cm from a lens of focal length 5cm. Draw the ray diagrams to show the formation of image if the lens is:

Converging, and
Diverging.

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Q 23Answer the following questions: [5 M]5 Marks

Construct ray diagrams to illustrate the formation of a virtual image using:

A converging lens, and.
A diverging lens.

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Q 24Answer the following questions: [5 M]5 Marks

An object placed 4cm in front of a converging lens produces a real image 12cm from the lens.

What is the magnification of the image?
What is the focal length of the lens?
Draw a ray diagram to show the formation of image. Mark clearly F and 2F in the diagram.

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Q 25Answer the following questions: [5 M]5 Marks

The speed of light in air is $3 \times 10^8m/ s$. In medium $X$ its speed is $2 \times 10^8m/ s$ and in medium $Y$ the speed of light is $2.5 \times 10^8m/ s.$ Calculate:

$air ^nx$
$air ^ny$
$X ^ny$

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Refraction of Refraction Science - Refraction of Refraction

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