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Physics problems: optics

image formation: thin lenses  

 

Problem 47.

A lens is made of glass with index of refraction 1.5. One side of the lens is flat, and the other is convex with the radius of curvature of 30 cm. What is the focal length of the lens?

Solution

 

Problem 48.

An object is placed 40 cm in front of the lens with the focal length of 50 cm. Where is the image located? The height of the object is 1 cm. What is the height of the image?

Solution

 

Problem 49.

An object is placed 70 cm in front of the lens with the focal length of 50 cm. Find the position of the image. If the height of the object is 1 cm, then what is the height of the image?

Solution

 

Problem 50.

An object is placed 40 cm in front of the lens. The focal length of the lens is -10 cm. Find the position and the height of the image. The height of the object is 2 cm.

Solution

 

Problem 55.

A 1.5-cm-diameter spider is 50 cm from a wall. Determine the focal length and the position (measured from the wall) of the lens that will make a half-size image of the spider on the wall.

Solution

 

Problem 56.

A 2.0-cm-tall object is 3.0 m from a wall. How many places can you put the lens with the focal length of 40 cm to form a well-focused image of the object on the wall?  

Solution

 

 

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