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10th P.S Quiz-14(Refraction at curved surfaces)by PRABHAKAR

Total questions: 40

Worksheet time: 20mins

Name
Class
Date
1.

The point where the rays meet is known as....

a)

centre of curvature

b)

the focal point

c)

optic centre

d)

Plane of the lens

2.

Which describes a convex lens?

a)

triangular in shape

b)

more transparent at the middle

c)

thicker at the edges than at the middle

d)

thicker at the middle than at the edges

3.
What does the word "diverging" mean?
a)
to spread apart
b)
to come together
c)
parallel
d)
perpendicular
4.

Which lens represents the path of light through a diverging lens?

a)
b)
c)
d)
5.

Equation for refraction oflight at curved surface is

a)

n1/u - n2/v = (n2 - n1)/R

b)

n2/u - n1/v = (n2 + n1)/R

c)

n2/v - n1/u = (n2 - n1)/R

d)

1/f = 1/v - 1/u

6.

------ lens is thin at the middle and thicker at the edges.

a)

Biconvex

b)

plano convex

c)

Biconcave

d)

glass slab

7.

Distances measured in the direction of the incident ray are taken as

a)

positive

b)

negative

c)

either positive or negative

d)

depends on lens

8.

Any ray which is passing along principal axis of a lens is -------

a)

passing through focus after refraction

b)

un deviated

c)

passing parallel to the principal axis after refracion

d)

can't pass

9.

Focal plane is the plane which is ..... to the principla axis -----

a)

parallel; at focus

b)

parallel; at optic centre

c)

perpendicular; at focus

d)

perpendicular; at optic centre

10.

Focal length of a lens depends on which of the following factore?

a)

Radii of curvature

b)

material of the lens

c)

medium inwhich the lens is placed

d)

all the above

11.

What type of image is formed when rays of light will not actually intersect?

a)

real

b)

virtual

c)

projected

d)

curved

12.

When an object is placed between the focal point and the convex lens, the image produced is ___.

a)

real, reduced, and inverted

b)

real, enlarged, and inverted

c)

virtual, enlarged, and erect

d)

virtual, reduced, and erect

13.

The object distance will be a _________________ value.

a)

positive

b)

negative

c)

either positive or negative

d)

can't say

14.

The image distance for a real image will be a _________________ value

a)

positive

b)

negative

c)

either positive or negative

d)

can't say

15.

When light travels through a lens and the image produced from the lens cannot be projected onto the screen, which type of image is produced?

a)

real

b)

refracted

c)

virtual

d)

inverted

16.

A glass lens is immersed in water. What will be the effect on the focal length of lens?

a)

increases

b)

decreases

c)

remains constant

d)

answer does not depend upon the medium

17.

an air bubble inside water behaves as

a)

converging lens

b)

Diverging lens

c)

magnifying lens

d)

none of the above

18.

An equiconvex lens of focal length 12 cm is cut into two halves as shown in figure. Find the focal length of each part?

a)

-24 cm

b)

24 cm

c)

12 cm

d)

-12 cm

19.

If the central portion of a convex lens is wrapped in black paper as shown in the figure

a)

No image will be formed by the remaining portion of the lens

b)

The full image will be formed but it will be less brightness

c)

The central portion of the image will be missing

d)

There will be two images each produced by one of the exposed

portions of the lens

20.

The above lens is a type of ___.

a)

concave lens

b)

convex lens

c)

plano concave lens

d)

concavo convex lens

21.

A student draws three rays of light from point P through a converging lens. Each point labelled. F is the principal focus of the lens. Which of the rays are drawn correctly?

a)

ray Y only

b)

ray Z only

c)

ray X and ray Y

d)

ray X and ray Z

22.
What type of image is formed when rays of light actually intersect?
a)
real
b)
virtual
c)
projected
d)
curved
23.
A ___ lens makes objects appear bigger.
a)
concave
b)
convex
c)
prism
d)
flat
24.

Which figure represents the path of light through a converging lens?

a)
b)
c)
d)
25.

A bird is flying down vertically towards the surface of water in a pond with constant speed. There is a fish inside the water. If that fish is exactly vertically below the bird, then the bird will appear to the fish to be :

a)

closer than its actualdistance

b)

moving slower than its actual speed

c)

farther away than its actual distance

d)

fish is unable to see the bird

26.

All the distances are measured from

a)

principal focus

b)

centre of curvature

c)

optic centre

d)

any where

27.

------ lens is also called as converging lens

a)

convex

b)

concave

c)

both concave and convex

d)

can't say

28.

The light ray passing through the focus will --- after refraction form a lens

a)

pass through centre of curvature

b)

parallel to the principal

c)

pass through optic centre

d)

undeviated

29.

what type of lens is the lens given in figure

a)

double convex

b)

plano convex

c)

double concave

d)

plano concave

30.

The ray passing through the ----- of the lens is not deviated.

a)

Focus

b)

optic centre

c)

centre of curvature

d)

none

31.

which lens always forms virtual image

a)

convex lens

b)

plano convex lens

c)

concave lens

d)

all the above

32.

Focal length of the plano convex lens is ----- when its radius of curvature is R and n is the refractive index of the lens.

a)

f=R

b)

f=R/2

c)

F=R(n−1)F=\frac{R}{\left(n-1\right)}

d)

F=(n−1)RF=\frac{\left(n-1\right)}{R}

33.

An object is placed at a distance of 10cm from a convex lens of focal length 10 cm. The image is formed at .....

a)

10 cm

b)

20 cm

c)

100 cm

d)

infinity

34.

The minimum distance between an object and its real image formed by a convex lens

a)

23f\frac{2}{3}f

b)

2f2f

c)

52f\frac{5}{2}f

d)

4f4f

35.

A concave lens forms a virtual image, when the object is placed

a)

in between F and optical centre

b)

at F

c)

beyond 2F

d)

any position before it

36.

A ray after refraction passes through focus, it passes ----- before incidence on lens

a)

through focus

b)

through optic centre

c)

parallel to principal axis

d)

through centre of curvature

37.

A convex lens forms a diminished image, when the object is placed

a)

at F

b)

beyond 2F

c)

between 2F anf F

d)

between F and O

38.

Height of the image is taken as negative for ----- images

a)

erect

b)

inverted

c)

virtual

d)

none of the above

39.

Magnification produced by a convex lens is -2, then the image is

a)

real, inverted and diminished

b)

virtual erected and diminished

c)

virtual, erected and magnified

d)

real, inverted and magnified

40.

which of the following is correct

a)

Convex lens always forms real image

b)

concave lens always forms magnified image

c)

convex lens always forms diminished image

d)

concave lens always forms virtual image

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