Light Reflection and Refraction Test

Result

Light Reflection and Refraction Test - 79

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Weekly Quiz Competition

Question 1
1 / -0

Distances measured perpendicular to and below the principal axis are taken as ________.

A
negative

B
positive

C
zero

D
one

Solution

Distances measured perpendicular to and below the principal axis(along y-axis) are taken as negative.
Question 2
1 / -0

The plane through the focus perpendicular to the axis of a mirror or lens is

A
Focal length

B
Focus

C
Focal Plane

D
Pole

Solution

The plane through the focus perpendicular to the axis of a mirror or lens is called Focal Plane.
Question 3
1 / -0

An object 4 cm in size, is placed at 20 cm in front of a concave mirror
of focal length 15 cm. Which of the following correctly represents the object distance (u) and focal length (f), as per New Cartesian sign
convention?

A
$$u= 20 cm, f =-15cm$$

B
$$u=-20 cm, f =-15cm$$

C
$$u=20 cm, f =15cm$$

D
$$u=-20 cm, f =15cm$$

Solution

Since object distance is kept in front of the concave mirror, it is taken to be negative. The focal length of the concave mirror is taken as negative.
Hence
$$u=-20 cm, f =-15cm$$
Question 4
1 / -0

All the distances measured to the left of the origin are taken as _________.

A
zero

B
positive

C
one

D
negative

Solution

New Cartesian Sign Convention.
Distance along left of pole of mirror is taken as negative and distance along right of pole is taken as positive..
Question 5
1 / -0

Focal length of concave lens is ________.

A
positive

B
negative

C
zero

D
none of the above

Solution

Focal length of concave lens is negative.
Question 6
1 / -0

Distances measured perpendicular to and above the principal axis are taken as ________.

A
negative

B
positive

C
zero

D
none of the above

Solution

Distances measured perpendicular to and above the principal axis(along + y-axis) are taken as positive.
Question 7
1 / -0

In the case of a convex mirror, the image distance is taken to be positive because:

A
Image is formed in front of the mirror

B
centre of curvature and focus lies behind the convex mirror

C
Image is always formed behind the mirror

D
None of these
Question 8
1 / -0

A spherical mirror has focal length -10cm. What type of mirror is it likely to be?

A
convex

B
concave

C
plane

D
none of the above

Solution

The mirror will be a concave mirror as the focal length for a concave mirror is taken to be negative.
Question 9
1 / -0

Focal length of convex lens is _________

A
Negative

B
Zero

C
Unity

D
Positive

Solution

Focal length of convex lens is positive.
The convex lens is a lens that converges rays of light that convey parallel to its principal axis (i.e. converges the incident rays towards the principal axis) which is relatively thick across the middle and thin at the lower and upper edges. The edges are curved outward rather than inward.
Question 10
1 / -0

In case of spherical mirrors, object distance is taken to be_______

A
positive

B
negative

C
unity

D
zero

Solution

According to the sign convention, the reflecting surface of the spherical mirrors is always towards the left hand side. The object is always placed in front of the mirror's reflecting surface. Hence object distance measured towards the left of the mirror is taken as negative.

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Re-Attempt Weekly Quiz Competition

Light Reflection and Refraction Test - 79

Result

Light Reflection and Refraction Test - 79

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SHARING IS CARING

Question 1

negative

positive

zero

one

Solution

Question 2

Focal length

Focus

Focal Plane

Pole

Solution

Question 3

$$u= 20 cm, f =-15cm$$

$$u=-20 cm, f =-15cm$$

$$u=20 cm, f =15cm$$

$$u=-20 cm, f =15cm$$

Solution

Question 4

zero

positive

one

negative

Solution

Question 5

positive

negative

zero

none of the above

Solution

Question 6

negative

positive

zero

none of the above

Solution

Question 7

Image is formed in front of the mirror

centre of curvature and focus lies behind the convex mirror

Image is always formed behind the mirror

None of these

Question 8

convex

concave

plane

none of the above

Solution

Question 9

Negative

Zero

Unity

Positive

Solution

Question 10

positive

negative

unity

zero

Solution

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