In order to obtain a real image of magnification 2 using a converging lens

Question

In order to obtain a real image of magnification 2 using a converging lens of focal length 20 cm, where should an object be placed

Options:

A . 50 cm

B . 30 cm

C . – 50 cm

D . – 30 cm

Answer: Option D
:
D
For real image m=-2

∴

M =

\frac{f}{u + f} \Rightarrow - 2 = \frac{f}{u + f} = \frac{20}{u + 20} \Rightarrow

u=-30 cm.

Was this answer helpful ?

Next Question

More Questions on This Topic :

Question 1. The graph shows how the magnification m produced by a convex thin lens varies with image distance v. What was the focal....What was the focal length of the used [DPMT 1995]

Question 2. The object distance u, the image distance v and the magnification m in a lens follow certain linear relations. The....m in a lens follow certain linear relations. These are

Question 3. A point object is placed at a distance of 25 cm from a convex lens of focal length 20 cm. If a glass slab of thickness t....the image is formed at infinity. The thickness t is

Question 4. An object 2.5 cm high is placed at a distance of 10 cm from a concave mirror of radius of curvature 30 cm &#....of curvature 30 cm The size of the image is

Question 5. A ray incident at an angle 53∘ on a prism and emerges at an angle of 37∘ as shown in figure. If the angle of inciden....50∘ then possible value of the angle of emergence is

Question 6. An object of size 7.5cm is placed in front of a convex mirror of radius of curvature 25cm at a distance of 40cm The size....distance of 40cm The size of the image should be

Question 7. A concave mirror of focal length 15 cm forms an image having twice the linear dimensions of the object. The position of ....of the object when the image is virtual will be

Question 8. A concave mirror of focal length 100 cm is used to obtain the image of the sun which subtends an angle of 30'. The diame....The diameter of the image of the sun will be

Question 9. A point object is placed at a distance of 10 cm and its real image is formed at a distance of 20 cm from a con....0.1 cm towards the mirror, the image will shift by about

Question 10. An object 1 cm tall is placed 4 cm infront of a mirror. In order to produce an upright image of 3 cm height on....produce an upright image of 3 cm height one needs a

Chapter 1 - GLOBAL STEEL SCENARIO & INDIAN STEEL INDUSTRY Part 1 : (13-04-2024) INDUSTRY AND COMPANY AWARENESS (ICA)

Direction Sense Test Part 1 Reasoning (Hindi)

Chapter 1 - RMHP / OHP / OB & BP Part 1 : (14-02-2024) GPOE

Cube & Cuboid Part 1 Reasoning (Hindi)

Data Interpretation (DI) Basic Concept Reasoning (Hindi)

Counting Figures Part 1 Counting Of Straight Lines Reasoning (Hindi)

Sail E0 free webinar Webinars

Real Numbers Part 7 Class 10 Maths

Real Numbers Part 1 Class 10 Maths

Polynomials Part 1 Class 10 Maths

DSP Combined 1 Free Revision Test SAIL JO E-0

GPOE / GPA Combined 1 Free Revision Test SAIL JO E-0

BSP Plant Specific Review Test SAIL JO E-0

BSL Combined 1 Free Revision Test SAIL JO E-0

GFM Combined 1 Free Revision Test SAIL JO E-0