Answer: Since focal length of concave mirror given is 20cm l. Object is at 40cm distance which means
it is at centre of curvature
. hence, image will be formed of same size and at centre focus only but real and inverted.
When an object is kept at a distance of 40 cm?
Answer: Since focal length of concave mirror given is 20cm l. Object is at 40cm distance which means
it is at centre of curvature
. hence, image will be formed of same size and at centre focus only but real and inverted.
When an object is placed at a distance 40 cm away from a concave mirror the magnification of the image is 1 the object is placed?
When an object is placed at a distance of 40 cm from a concave spherical mirror, the magnification produced is
1/2
, where should the object be placed to get a magnification of 1/32 Ans.
When an object 40cm high is placed in front of a plane mirror at a distance of 100 cm then the size of the image will be?
Answer: when an object 40 cm high is placed in front of a plane mirror at a distance of 100 cm then the size of the image will be also
20 cm
.
What is the formula for image distance?
where u is the distance of the object from the lens; v is the distance of the image from the lens and f is the focal length, i.e., the distance of the focus from the lens. N.B. other sign conventions are sometimes used in the literature. = 2 6 − 1 6 = 1 6 So
v = 6 cm
.
Where would the image be if the object is moved 20 cm towards the mirror?
if the object is moved 20cm towards the mirror the object is placed at
F ie at the principal focus
and the image is formed at infinity.
What is called a source of light?
Any object that gives out light
is called a source of light. Luminous objects are also called sources of light. Sources of light can be natural or artificial (man-made). Examples of natural sources of light are ‘he sun and other stairs and insects like the firefly.
When an object is placed at a distance of 60 cm from a concave mirror?
Now we have found that the focal length of the mirror is 60 cm. Now again applying the second case of magnification in the mirror. so to get the magnification of 1/3 we should place the object at a distance of
120 cm
from the mirror. Therefore, the correct answer will be 120 cm.
What will be the height of image when an object of 2mm?
Height of the image h’ = mh = 0.5 x 2mm =
1 mm
.
When an object is placed in front of a convex mirror?
The ray diagram above illustrates that the image of an object in front of a convex mirror will be located at a
position behind the convex mirror
. Furthermore, the image will be upright, reduced in size (smaller than the object), and virtual.
When an object 20 cm high is placed in front of a plane mirror at a distance of 100 cm then the size of the image will be?
An object is placed 20 cm in front of a plane mirror then the image is formed at 20 cm behind the mirror. If the mirror is moved 2 cm toward the object. Hence, The total distance between the positions of the original and final image is
4 cm
.
What happens to the image distance if the object distance decreases?
Starting from a large value, as the object distance decreases (i.e., the object is moved closer to the lens), the
image distance increases
; meanwhile, the image height increases.
When an object is at focus then where will be the formation of image?
| Position of the object Position of the image Nature of the image | At infinity At focus, F Inverted and Real | Beyond C Between F and C Inverted and Real | At C At C Inverted and Real | Between C and F Beyond C Inverted and Real |
|---|
What is the symbol of object distance?
The object distance is the distance of the object to the centre line of the lens. This is denoted by the
symbol do
. The image distance (sometimes confused with the focal length) is the distance of the image to the centre line of the lens. This is denoted by the symbol di .
Is object distance positive or negative?
object distance is always negative for all the lens & mirrors
. image distance depends on object distance in case of concave mirror and convex lens. ‘v’ is always positive for convex mirror & concave lens.
Which is lens formula?
What is the Lens Formula? Answer: According to the convex lens equation, the lens formula is
1/f = 1/v + 1/u
. It relates the focal length of a lens with the distance of an object which is placed in front of it and the image formed of that object.
