class 10 chapter 10 cbse previous year all question
1. NEXT TOPPER INSTITUTE
हम आपके सपनो को साकार करेंगे
An object 3.0 cm high is placed perpendicular to the principal axis of a
concave lens of focal length 30 . the image is formed at a distance of 10.cm
from the lens calculate distance at which
object is placed ,size and nature of image formed .
2. A concave lens has focal length of 20 cm .at what distance from the lens
,a 5 cm tall object be placed so that it formed an image at 15 cm from the lens .
also calculate the size of the image formed ?
3. Find the power of a concave lens of focal length 2 m.
4. An object of height 5 cm is placed perpendicular to the principal axis of
a concave lens of focal length 10 cm. if the distance of the object from the
optical center of the lens is 20 cm determine the position ,nature and size of
the image formed using the lens formula .
5. The image of an object formed by a convex lens is of the same size as
that of the object . if the image is formed at a distance of 50 cm from the lens
, at what distance from the lens is the object placed ? find the focal length and
the power of the lens used .
6. A concave diverging lens of focal length 15 cm forms an image 19 cm from
the lens . how far is the object from the lens ?draw the ray diagram .
7. A needle placed 45 cm from a lens forms an image on the screen placed
90 cm on the side of the lens . Identify the type of lens. Determine its focal
length and the power. What size of the image if needle is 5 cm in height?
8. One half of a convex lens of focal length 10 cm is covered with a black
paper . can such a lens produce an image of a complete object placed at a
distance of 30 cm from the lens? Draw a ray diagram to justify your answer ?
9. In above question a 4 cm tall object is placed perpendicular to principal
axis of a convex lens of focal length 20 cm the distance of the object from the
lens is 15 cm . find the nature ,position and the size of the image .
10.The image of an object formed by a lens is of magnification -1 . if the
distance between the object and its image is 60 cm , what is the focal of the
lens ? if the object is moved 20 cm towards the lens , where would the image be
formed ? state reason and also draw a ray diagram in
support of your answer ?
11.Find the position nature and size of the image formed by a convex lens of focal length 18 cm of an
object 3 cm high placed at a distance 27 cm from it
12.A 5 cm tall object is placed perpendicular to the principal axis of convex
lens of focal length 20 cm. the distance of the object from the lens is 30 cm .by
calculation determine the position , the size of image formed .
13.
Comments
question 6. v= 19cm find u