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Physics - Optics - Problems with Solutions and Tutorials

optics, mirrors
A concave mirror has a focal length of 1m. What's the image's distance, and what does it look like, if the object is placed at 2.5, 2, 1.5, 1, 0.5 m in front of the mirror.

What about convex mirrors, and convex and concave lenses?


Answer: see tutorial video

Solver Input: f=1,i=?,o=2.5

Tutorial video:
optics, mirrors
A concave mirror has a radius of curvature of 140cm. How far must you stand in front of it in order to see an erect image of yourself magnified 3 times its original size?

Answer: o=46.7cm

Solver Input: see tutorial video

Tutorial video:
optics, mirrors
An object is placed 1m in front of a mirror. The image is erect, and 1/3 the original size of the object. What is the radius of curvature of the mirror? What type of mirror is it?

Answer: r=-1m, it's a convex mirror

Solver Input: d_obj=1,erect_img,magnification=1/3,r=?

Tutorial video:
optics, lenses
A diverging lens has a focal length of 20cm. An object 10cm high is placed 20 cm in front of it. What is the height and distance of the image?

Answer: hi=-5cm, i=-10cm, negative bcz it's virtual

Solver Input: see tutorial video

Tutorial video:
optics, lenses
A screen is placed 45cm behind a converging lens with a focal distance of 30cm. Where should the object be placed such that the image is cast onto the screen?

Answer: o=90cm

Solver Input: see tutorial video

Tutorial video:
optics, lenses
I have an object, and I have a screen where the image will form. They are 50 cm apart. Now, I have a converging lens with a focal length of 10cm. Where should I place the lens such that the image will be cast on the screen?

Answer: place lens with o=36cm, i=14cm (o+i=50cm)

Solver Input: see tutorial video

Tutorial video:
Click here to see tutorial