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Assignment Task :

Questions  

Questions 1–10: please refer to your online learning resources -Spherical and astigmatic lenses to  answer the following questions.  

1. Complete the following sentence regarding lens curvature:

a) The shorter the radius the  

b) The longer the radius the 

2. Complete the following sentences about the Cartesian Convention:

a) The basic ‘road rule’ for the Cartesian Convention is that light travels from   to  

b) Any, measurements made to the right of the lens are  

c) Any measurements made to the left are  

d) What signs are important as they tell us the position of the object and image from the lens? 

3. Define the term dioptre and state what it is used for: 

4. What is the difference between a real image and a virtual image?  

5. Calculate the focal length of the following spherical lenses:  

a) +2.75 D lens  

b) −3.50 D lens 

6. Calculate the focal length of a combination of lenses, whose individual focal lengths are:   

a) –266.67 mm  

b) +307.69 mm  

c) –800 mm  

d) –1333.33 mm  

e) +444.44 mm  

f) +571.43 mm  

7. Calculate the surface powers, total power, sketch and name the lens form for the following lenses:  8 marks  

a) r1 = ∞, r2 = +158.73 mm, n = 1.582  

(b) r1 = +24.65 mm, r2 = +30.92 mm, n = 1.456 4 marks  

8. Calculate the position of the focus if light is incident to a + 6.50 D lens from an object 400 mm in  front of the lens.

 

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  • Posted on : February 24th, 2018

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