Acids, Bases And Salts

Question

A convex lens has a focal length of 25 cm. Calculate the distance of the object from the lens if the image is to be formed on the side of the lens at a distance of 75 cm from the lens. What would be the nature of the image?

Solution

Given a convex lens.

Here,
Focal length, f = +25 cm.
Image distance, v = + 75 cm

By lens formula,

$\frac{1}{v} - \frac{1}{u} = \frac{1}{f}$

$∴$ $\frac{1}{u} = \frac{1}{v} - \frac{1}{f} = \frac{1}{75} - \frac{1}{25} = \frac{1 - 3}{75} = - \frac{2}{75}$

i.e., $u = - \frac{75}{2} = - 37.5 cm .$

The object is at 37.5 cm from the lens and the image is real and inverted.

Some More Questions From Acids, Bases and Salts Chapter

What is an optical medium? How can we classify different media on the basis of their behaviour towards light?

What do you mean by reflection, refraction and absorption of light?

Which type of phenomenon (reflection or refraction) occurs when light falls on (i) a highly polished surface like a mirror and (ii) a transparent medium like glass or water?

What is meant by the optical image of an object?

What are real and virtual images? Can these images be obtained on a screen? Give reasons in support of your answer.

Give three points of differences between real and virtual images.

What is a mirror? Mention the different types of mirrors commonly used.

Define the following terms in connection with reflection of light:
Incident ray, reflected ray, point of incidence, normal, angle of incidence and angle of reflection.

For Daily Free Study Material Join wiredfaculty

WhatsApp Group

Download Android App

Ncert Book Download

Acids, Bases And Salts

A convex lens has a focal length of 25 cm. Calculate the distance of the object from the lens if the image is to be formed on the side of the lens at a distance of 75 cm from the lens. What would be the nature of the image?

Some More Questions From Acids, Bases and Salts Chapter

What is an optical medium? How can we classify different media on the basis of their behaviour towards light?

What do you mean by reflection, refraction and absorption of light?

Which type of phenomenon (reflection or refraction) occurs when light falls on (i) a highly polished surface like a mirror and (ii) a transparent medium like glass or water?

What is meant by the optical image of an object?

What are real and virtual images? Can these images be obtained on a screen? Give reasons in support of your answer.

Give three points of differences between real and virtual images.

What is a mirror? Mention the different types of mirrors commonly used.

Define the following terms in connection with reflection of light:
Incident ray, reflected ray, point of incidence, normal, angle of incidence and angle of reflection.

State the laws of reflection of light.

Are the laws of reflection applicable to plane surfaces also valid for curved surfaces?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Phone Number

Email Address

Location

For Daily Free Study Material Join wiredfaculty

WhatsApp Group

Download Android App

Ncert Book Download

Acids, Bases And Salts

A convex lens has a focal length of 25 cm. Calculate the distance of the object from the lens if the image is to be formed on the side of the lens at a distance of 75 cm from the lens. What would be the nature of the image?

Some More Questions From Acids, Bases and Salts Chapter

What is an optical medium? How can we classify different media on the basis of their behaviour towards light?

What do you mean by reflection, refraction and absorption of light?

Which type of phenomenon (reflection or refraction) occurs when light falls on (i) a highly polished surface like a mirror and (ii) a transparent medium like glass or water?

What is meant by the optical image of an object?

What are real and virtual images? Can these images be obtained on a screen? Give reasons in support of your answer.

Give three points of differences between real and virtual images.

What is a mirror? Mention the different types of mirrors commonly used.

Define the following terms in connection with reflection of light:Incident ray, reflected ray, point of incidence, normal, angle of incidence and angle of reflection.

State the laws of reflection of light.

Are the laws of reflection applicable to plane surfaces also valid for curved surfaces?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Define the following terms in connection with reflection of light:
Incident ray, reflected ray, point of incidence, normal, angle of incidence and angle of reflection.