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Understanding the Thin Lens Formula

Understanding the Thin Lens Formula

Assessment

Interactive Video

Mathematics, Physics, Science

7th - 10th Grade

Practice Problem

Hard

Created by

Ethan Morris

FREE Resource

The video tutorial on ScienceChomp introduces the thin lens formula, 1/f = 1/p + 1/q, where f is the focal length, p is the object distance, and q is the image distance. The tutorial walks through an example problem, demonstrating how to calculate the focal length when given object and image distances. The instructor emphasizes the importance of writing the formula, substituting known values, making denominators the same, and solving the equation through cross-multiplication. The tutorial concludes with a review of the steps and a preview of the next topic on image distance.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the variable 'f' represent in the thin lens formula?

Lens thickness

Image distance

Object distance

Focal length

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the thin lens formula, which units can be used to measure the distances?

Kilometres, metres, or centimetres

Nanometres, micrometres, or millimetres

Metres, centimetres, or millimetres

Inches, feet, or yards

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

If an object is 50 cm away from a lens and the image is 100 cm away, what is the first step to find the focal length?

Cross-multiply the distances

Convert all distances to metres

Write down the thin lens formula

Add the object and image distances

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the next step after substituting the known values into the thin lens formula?

Add the object and image distances

Convert distances to the same unit

Make the denominators the same

Subtract the object distance from the image distance

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How do you make the denominators the same in the thin lens formula?

Divide the larger denominator by the smaller one

Subtract the smaller denominator from the larger one

Multiply the smaller denominator by a factor

Add the numerators

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the result of cross-multiplying in the thin lens formula problem?

1 times 100 equals 3 times f

1 times f equals 100 times 3

f times 100 equals 3 times 1

3 times 100 equals 1 times f

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

After cross-multiplying, how do you solve for the focal length 'f'?

Divide both sides by 3

Multiply both sides by 3

Subtract 3 from both sides

Add 3 to both sides

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