(a) Which ray diagram shows total reflection at an air and glass boundary? (b) Figure 1 is a ray diagram for a converging lens when used as a magnifying glass. (i) Using information from Figure 1, determine the magnification of the virtual image. Use the equation magnification = (ii) Describe one way the magnification of the image could be increased. (c) Figure 2 shows a converging lens used to produce a real image on a screen. The apparatus is used to find the focal length, f, of the lens. The distance from the object to the lens, a = 20 cm. The distance from the image to the lens, b = 40 cm. Calculate the focal length, f, of the lens. Use the equation $$\frac{1}{f} = \frac{a+b}{a \times b}$$ focal length f =

GCSE Edexcel Physics Lenses: (a) Which ray diagram shows tota

(a) Which ray diagram shows total reflection at an air and glass boundary? (b) Figure 1 is a ray diagram for a converging lens when used as a magnifying glass - Edexcel - GCSE Physics - Question 1 - 2022 - Paper 1

Question 1

(a) Which ray diagram shows total reflection at an air and glass boundary? (b) Figure 1 is a ray diagram for a converging lens when used as a magnifying glass. (i)... show full transcript

Worked Solution & Example Answer:(a) Which ray diagram shows total reflection at an air and glass boundary? (b) Figure 1 is a ray diagram for a converging lens when used as a magnifying glass - Edexcel - GCSE Physics - Question 1 - 2022 - Paper 1

Step 1

Using information from Figure 1, determine the magnification of the virtual image.

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Answer

To determine the magnification ( ext{M}) of the virtual image, we use the formula:

$M = \frac{\text{height of image}}{\text{height of object}}$

Assuming that the height of the virtual image is given as 'h_i' and the height of the object as 'h_o', plug in the values:

$M = \frac{h_i}{h_o}$

The specific values should be extracted from Figure 1.

Step 2

Describe one way the magnification of the image could be increased.

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Answer

One way to increase the magnification is to use a different lens that has a higher power. A lens with a shorter focal length will result in a larger magnification. Specifically, switching to a stronger lens or a lens that is thicker and more curved will increase the magnification effectively.

Step 3

Calculate the focal length, f, of the lens.

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Answer

Using the provided data, we know:

a = 20 cm
b = 40 cm

Now, substituting these values into the equation:

$\frac{1}{f} = \frac{a+b}{a \times b}$

Calculating:

$\frac{1}{f} = \frac{20 + 40}{20 \times 40} = \frac{60}{800} = \frac{3}{40}$

Thus, taking the reciprocal:

$f = \frac{40}{3} \approx 13.33 \text{ cm}$

(a) Which ray diagram shows total reflection at an air and glass boundary? (b) Figure 1 is a ray diagram for a converging lens when used as a magnifying glass - Edexcel - GCSE Physics - Question 1 - 2022 - Paper 1

Worked Solution & Example Answer:(a) Which ray diagram shows total reflection at an air and glass boundary? (b) Figure 1 is a ray diagram for a converging lens when used as a magnifying glass - Edexcel - GCSE Physics - Question 1 - 2022 - Paper 1

Using information from Figure 1, determine the magnification of the virtual image.

Describe one way the magnification of the image could be increased.

Calculate the focal length, f, of the lens.

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