Question

. What happens if concave mirror is used as rear view mirror ?
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Answer 1

Question:-

• What would happen if concave mirror is used as rear view mirror?

Answer:-

Well... this could be an interesting question to understand but it's answer is simple. We know that rear view mirror is called so because it provides a rear or wider view which is mainly used in cars to see more number of vehicles behind.   But concave mirror forms inverted image in all cases except one when object is placed véry close (between pole and focus) to the surface of mirror so obviously it would be véry difficult for driver to see objects (cars) behind which are inverted. Also, the surface of concave mirror is curved inside so it can't provide a rear view when used. Hence we can't use concave mirror as rear view mirror.

More:-

• Which mirror is used by dentists and why?

» Dentists use concave mirror because when the mirror is véry close to the object, it provides an irect and enlarged image. Thus it would help the dentist to examine the problem in teeth.

• Which mirror is used in reflectors for search light and why?

» In search lights, concave mirror is used because when object is placed between focus and radius of curvature, the mirror surface forms parallel beam of light which will travel more and helps you see farther.

• What type of mirror is used in shaving?

» While shaving, barbers use concave mirror to produce larger image and helps easier to shave.

Answer 2

PROBLEMS OF USING CONCAVE MIRRORS AS REAR VIEW MIRRORS IN CARS:

• Concave mirrors can form varied type of images depending on the object distance from the mirror. (The object here is the vehicles/trees/wall,etc. behind the car)

• Now, the following cases arise:

1. If the object is too close to the car (object distance < Focal length), then a magnified, virtual and erect image will be formed.

2. If the object is a little far away (object is between Focus and Centre of curvature), then a real, inverted and magnified image will be formed.

3. If the object is even far away (object is beyond centre of curvature), a diminished, inverted, real image will be formed.

• Whenever such varied type of images are formed it is extremely difficult for the driver of the car to look for surrounding objects.

• Especially when the images are real, the driver will never be able to see the image because real images required a screen to be projected.

• And that's why CONVEX MIRRORS ARE USED , BECAUSE THEY ALWAYS PRODUCE VIRTUAL, DIMINISHED IMAGE.

$\star$ Hope It Helps.