A dentist wants a small mirror that when placed 2cm from a tooth- will produce 3- upright image- What kind of mirror must be used and what must its focal length be-

The correct option is D Convex mirror, 3.0 cm m=+vu=+fu f 3=+f+2+f⇒ f=3cm . ...

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard XII

Physics

Mirror Formula

A dentist wan...

Question

A dentist wants a small mirror that when placed $2$ cm from a tooth, will produce $3 \times$ upright image. What kind of mirror must be used and what must its focal length be?

Concave mirror,

3.04

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Concave mirror,

1.5

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Convex mirror,

3.0

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Convex mirror,

1.5

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is D Convex mirror, $3.0$ cm
$m = + \frac{v}{u} = \frac{+ f}{u - f}$
$3 = \frac{+ f}{+ 2 + f} \Rightarrow f = 3 c m$ .

Suggest Corrections

Similar questions

Q. The focal length of a small concave mirror is 2.5 cm. In order to use this concave mirror as a dentist's mirror, the distance of tooth from the mirror should be:

(a) 2.5 cm
(b) 1.5 cm
(c) 4.5 cm
(d) 3.5 cm

Q. An object of height

1.5 c m

is situated at a distance of

15 c m

from a concave mirror. The concave mirror forms its real image of height

3.0 c m

. The focal length of concave mirror will be :

Q. A dentist uses a mirror in front of a decayed tooth at a distance of 4 cm from the tooth to get 4 times magnified the image. Use mirror formula to find the focal length and nature of mirror used. What is the nature of the image?

When an object of height 1 cm is kept at a distance of 4 cm from a concave mirror, its upright image of height 1.5 cm is formed at a distance of 6 cm behind the mirror. Calculate the focal length of the mirror ___

At what distance from a concave mirror of focal length 10 cm should an object be placed so that : (a) its real image is formed 20 cm from the mirror ? (b) its virtual image is formed 20 cm from the mirror ?

Join BYJU'S Learning Program

A dentist wants a small mirror that when placed 2cm from a tooth, will produce 3× upright image. What kind of mirror must be used and what must its focal length be?

The correct option is D Convex mirror, 3.0 cmm=+vu=+fu−f3=+f+2+f⇒f=3cm.

A dentist wants a small mirror that when placed $2$ cm from a tooth, will produce $3 \times$ upright image. What kind of mirror must be used and what must its focal length be?

The correct option is D Convex mirror, $3.0$ cm
$m = + \frac{v}{u} = \frac{+ f}{u - f}$
$3 = \frac{+ f}{+ 2 + f} \Rightarrow f = 3 c m$ .