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skg94
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Homework Statement
Im having problems with these questions i just can't seem to get them
Any help would be good thank you in advance
1. An object located 40cm in front of a mirror produces an erect image 80cm from the mirror. Find the radius of curvature for the mirror, and state the type of mirror. (ans:160cm,concave)
2. An object located 40cm infront of a mirror produces an inverted image 120cm from the mirror. Find the radius of curvature for the mirror, and state the type of mirror. (ans:60cm,concave)
3. An object located 40cm infront of a mirror produces an erect image 20cm from the mirror. Find the radius of curvature for the mirror, and state the type of mirror. (-80cm,convex)
4. A 20cm object located 30cm in front of a mirror generates an erect image that is 10 cm tall. What is the size of image produced when he object is moved 60cm further from the mirror's surface? (5cm)
5. An object located infront ofa concave mirror with a radius of curvature of 80cm produced an inverted image that is three times the size of the object. What is the object distance? (53)
6. An object located infront of a concave mirror with a radius of curvature of 180cm produced an erect image that is two times the szie of the object. What is the object distance? (45)
7. An object located in front of a convex mirror with a focal length of 60cm produced an erect image that is 1/6 the size of the object. What is the object distance? (300cm)
Homework Equations
1/f=1/d(object)+1/d(image)
m=Hi/Ho=-Di/Do
radius = c = 2f
The Attempt at a Solution
1 f= (do^-1+di^-1)^-1
= (40^-1) +(80^-1) ^ -1 = 26.6
c = 53 , which is wrong.
For the next 3 questions i substitued the values as i did above, perphaps my equation is wrong or am i substituting wrong?
Question 4, since its moved to 60cm which is double the previous, does that make it just half the image height based on ratio?
5-7 i have no idea