Worksheets10th P.S QUIZ-7(REFRACTION AT CURVED SURFACES-1)BY PRABHAKAR
Total questions: 20
Worksheet time: 10mins
The point where the rays meet is known as....
centre of curvature
the focal point
optic centre
Plane of the lens
A real image...
is produced by virtual rays and can be projected on a screen
is produced by real rays and cannot be projected on a screen
is produced by virtual images and cannot be projected on a screen
is produced by real rays and can be projected on a screen
Which describes a convex lens?
triangular in shape
more transparent at the middle
thicker at the edges than at the middle
thicker at the middle than at the edges
Which lens represents the path of light through a diverging lens?
Which figure represents the path of light through a converging lens?
Equation for refraction oflight at curved surface is
n1/u - n2/v = (n2 - n1)/R
n2/u - n1/v = (n2 + n1)/R
n2/v - n1/u = (n2 - n1)/R
1/f = 1/v - 1/u
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 :
closer than its actualdistance
moving slower than its actual speed
farther away than its actual distance
fish is unable to see the bird
------ lens is thin at the middle and thicker at the edges.
Biconvex
plano convex
Biconcave
glass slab
All the distances are measured from
principal focus
centre of curvature
optic centre
any where
Distances measured opposite to the direction of the incident ray are taken as
positive
negative
either positive or negative
depends on lens
------ lens is also called as converging lens
convex
concave
both concave and convex
can't say
Any ray which is passing along principal axis of a lens is -------
passing through focus after refraction
un deviated
passing parallel to the principal axis after refracion
can't pass
The light ray passing through the focus will --- after refraction form a lens
pass through centre of curvature
parallel to the principal
pass through optic centre
undeviated
Focal plane is the plane which is ..... to the principla axis -----
parallel; at focus
parallel; at optic centre
perpendicular; at focus
perpendicular; at optic centtr
Number of images formed by a lens made up of three different materials
1
2
3
o
Focal length of a lens depends on which of the following factore?
Radii of curvature
material of the lens
medium inwhich the lens is placed
all the above
what type of lens is the lens given in figure
double convex
plano convex
double concave
plano concave
