Light Reflection and Refraction Test

Result

Light Reflection and Refraction Test - 1

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Question 1
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Virtual, erect and diminished image are the characteristic features of a:

A
Convex mirror

B
Concave mirror

C
Biconcave mirror

D
Plane mirror

Solution

Explanation:

A convex mirror always forms an erect, and a virtual and diminished image, for any position of the object.
Question 2
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How does the frequency of a beam of ultra-violet light change when it goes from air into glass?

A
Frequency increases

B
None of these

C
Remains the same

D
Frequency decreases

Solution

Explanation:

The frequency of light depends on the source of light and remains the same during refraction. The speed of the light changes when a ray of light passes from one medium to another. The speed of light is higher in a rarer medium than a denser medium. A ray of light travelling from a rarer medium to a denser medium slows down, due to which there is a change in the wave-length.
Question 3
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Where will the image be formed if the object is at the focus of the concave mirror?

A
At C

B
Beyond C

C
Between C and F

D
Infinity

Solution

Explanation:

If the object is placed at the focus of the concave mirror, the image will be formed at infinity. The image will be highly enlarged, and will be real and inverted.
Question 4
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A convex lens is:

A
Thicker at the edges than at the middle.

B
Of uniform thickness everywhere.

C
Thicker at the middle than at the edges.

D
Called a diverging lens.

Solution

Explanation:

A convex lens (converging lens) is thicker at the middle than at the edges. A concave lens (diverging lens) is thicker at the edges than at the middle.
Question 5
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Which type of mirror is used in ophthalmoscope to examine throat and ear?

A
Concave

B
Plane mirror

C
Convex

D
Reflecting mirror

Solution

Explanation:

A concave mirror is used in ophthalmoscope to examine throat and ear. A concave mirror forms an enlarged image of the part being examined by a physician. An image formed by a plane mirror is of an equal size as that of the object, whereas a convex mirror always forms a diminished image, for any position of the object.