Physics Practicals Class 12

Convex Lens – Focal Length

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About Simulation

  • This simulation will give an entire idea about image formation by convex lens in focal length of convex lens experiment.
  • You will get the knowledge of determining focal length, the basics of convex lens and lens formula.
  • You will learn and apply the lens formula to find the focal length of the convex lens.
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  • All the experiment steps and procedures, like measuring the image and object distance, removing parallax error, calculating index correction, etc., and many more are highly interactive and have been simulated in a very similar manner as you do in a physics lab.

Convex Lens

  • This will help learners to better prepare for various competitive exams such as IIT-JEE (JEE Main & Advanced), NEET, and Olympiads.

Simulation Details

Duration – 30 Minutes
Easily Accessible
Language – English
Platforms – Android & Windows


For an object placed at a distance 𝑢 from the optical centre of a thin convex lens of focal length 𝑓, a real and inverted image is formed on the other side of the lens at a distance 𝑣 from the optical centre. $$ \frac{1}{f}=\frac{1}{v}-\frac{1}{u}$$

According to sign conventions, 𝑢 = −ve, 𝑣 = +ve

$$\Rightarrow f=\frac{u v}{u+v}$$

Convex Lens – Focal Length

Here, figure (a) shows image formation by a convex lens when 𝑢 = 2𝑓 and figure (b) shows
the image formation by a convex lens when 2𝑓 > 𝑢 > 𝑓.

The graph of 1 𝑣 versus 1 𝑢 is a straight line with a negative slope.

$$\text{ If } \frac{1}{v}=0 \text{ or } \frac{1}{u}=0, \text{ then } \frac{1}{u}=\frac{1}{f} \text{ or } \frac{1}{v}=\frac{1}{f}$$

The graph of 𝑢 versus 𝑣 is a hyperbola. When 𝑢 = 𝑣, then 𝑢 = 𝑣 = 2𝑓.

Requirements for this Science Experiment

Optical Bench Convex Lens Optical Needles Uprights Lens Holder

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