A convex mirror has a focal length f. A real object is placed at a distance of f 2 from the pole. Find out the position, magnification and nature of the image.

The mirror formula is 1 v + 1 u = 1 f , The focal length is taken positive for convex mirror. The position of the object u = - f 2 , 1 v - 2 f = 1 f ⇒ v = f 3 , The magnification is m = - v u ⇒ m = - f 3 - f 2 ⇒ m = + 2 3 , The image formed is virtual, erect and smaller than object.

A convex mirror has a focal length f. A real object is placed at a distance of f 2 from the pole. Find out the position, magnification and nature of the image.

The mirror formula is 1 v + 1 u = 1 f , The focal length is taken positive for convex mirror. The position of the object u = - f 2 , 1 v - 2 f = 1 f ⇒ v = f 3 , The magnification is m = - v u ⇒ m = - f 3 - f 2 ⇒ m = + 2 3 , The image formed is virtual, erect and smaller than object.

E M B I B E

Beta Question Bank for Medical: Physics>Chapter 30 - Ray Optics>BEGINNER'S BOX - 2>Q 3

EASY

NEET

IMPORTANT

Earn 100

A convex mirror has a focal length f. A real object is placed at a distance of $\frac{f}{2}$ from the pole. Find out the position, magnification and nature of the image.

Important Questions on Ray Optics

HARD

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 30 - Ray Optics>BEGINNER'S BOX - 2>Q 7

A small candle,

2.5 c m

in size is placed at

27 c m

in front of a concave mirror of radius of curvature

36 c m

. At what distance from the mirror should a screen be placed in order to obtain a sharp image? Describe the nature and size of the image. If the candle is moved closer to the mirror, how would the screen have to be moved?

EASY

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 30 - Ray Optics>BEGINNER'S BOX - 3>Q 2

A light ray is moving from denser (refractive index =

μ

) to air. If the angle of incidence is half the angle of refraction, find out the angle of refraction.

MEDIUM

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 30 - Ray Optics>BEGINNER'S BOX - 5>Q 2

There is a small air bubble inside a glass sphere ( $μ$ = 1.5) of radius 10 cm. The bubble is 4 cm below the surface and is viewed normally from the outside as shown in figure. Find the apparent depth of the bubble.

Question Image

MEDIUM

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 30 - Ray Optics>BEGINNER'S BOX - 5>Q 3

Calculate the resolving power of astronomical telescope, assuming the diameter of the objective lens to be

6 cm

and wavelength of light used to be

540 mm

.

MEDIUM

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 30 - Ray Optics>BEGINNER'S BOX - 5>Q 4

Calculate the limit of resolution of a microscope if an object of numerical aperture 0.12 is viewed by using light of wavelength 6 × 10^–7 m.

EASY

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 30 - Ray Optics>BEGINNER'S BOX - 6>Q 1

An object is placed at the distance of 30 cm in front of a convex lens of focal length 10 cm. Find the position of the image, its nature and magnification.

EASY

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 30 - Ray Optics>BEGINNER'S BOX - 6>Q 2

A planoconvex lens has a focal length of 30 cm and an index of refraction 1.5. Find the radius of the convex surface.

MEDIUM

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 30 - Ray Optics>BEGINNER'S BOX - 6>Q 3

A biconvex lens (