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प्रश्न
A convex mirror used as a rear-view mirror in a car has a radius of curvature of 3 m. If a bus is located at a distance of 5 m from this mirror, find the position of image. What is the nature of the image?
उत्तर
A convex mirror used as a rear-view mirror in a car has a radius of curvature of 3 m. If a bus is located at a distance of 5 m from this mirror, find the position of image. What is the nature of the image?
`1/f=1/v+1/u`
⇒`1/1.5+1/v+1/-5`
⇒`10/15+1/5=1/v`
⇒`10/15+3/15=1/v`
⇒`1/v=13/15`
=`v=15/13=1.15m`
Thus, the distance of the image 'v' is 1.15 m behind the mirror.
Now, using the magnification formula, we get
`m=(-v)/u`
`m=((-1.15))/-5 =115/500=0.223`
Thus, the image is virtual, erect and smaller in size.
संबंधित प्रश्न
An object is placed at a distance of 30 cm in front of a convex mirror of focal length 15 cm. Write four characteristics of the image formed by the mirror.
A student obtains a blurred image of a distant object on a screen using a convex lens. To obtain a distinct image on the screen he should move the lens
(A) away from the screen
(B) towards the screen
(C) to a position very far away from the screen
(D) either towards or away from the screen depending upon the position of the object
What type of image/images are formed by:
a concave mirror?
If you want to see an enlarged image of your face, state whether you will use a concave mirror or a convex mirror?
State three characteristics of the image formed by a convex mirror.
The image formed by a spherical mirror is virtual. The mirror will be:
(a) concave
(b) convex
(c) either concave or convex
(d) metallic
An object 1 cm tall is placed 30 cm in front of a convex mirror of focal length 20 cm. Find the size and position of the image formed by the convex mirror.
An object is placed at the following distance from a convex lens of focal length 15 cm:
(a) 35 cm
(b) 30 cm
(c) 20 cm
(d) 10 cm
Which position of the object will produce:
(i) a magnified real image?
(ii) a magnified virtual image?
(iii) a diminished real image?
(iv) an image of same size as the object?
At the point of incidence, a line drawn at right angles to the surface, separating the two media, is called the normal.
Write true or false
At the point of incidence, a line drawn at right angles to the surface, separating the two media, is called the normal.
