video1 types of lenses, definitions
convex lens explanation ,focus ,image formation
https://www.youtube.com/watch?v=R-uMcngNsSk
video focus of concave lens
https://www.youtube.com/watch?v=JRdZF5AUZ9A
3 Rays used for drawing ray diagram and image formd by convex lens
Q) What kind of image is formed by a concave
lens irrespective of the position of the object?
1.
virtual,
upright and diminished
2.
real,
upright and diminished
3.
virtual,
upright and magnified
4.
real,
inverted and magnified
Q)A
lens forms an erect image for all positions of the object in front of it. Is
the lens convex or concave?
http://hyperphysics.phy-astr.gsu.edu/hbase/geoopt/lenseq.html
Q9)A 16-cm tall object is placed 36 cm from a converging lens that has a focal length of 10 cm. a)At what distance from the lens will the image be formed?
b)How tall is the image formed? c)Describe the image formed .
Q10)A diverging lens has a focal length of 15 cm. An object of height 5cm is located 20 cm from the surface of the lens.
a)Calculate how far the image is from the lens.
b)Determine whether the image is real or virtual.
c)Calculate the magnification of the image d) Calculate the height of the image.
11)The object is 10 centimeters in height and is located at a distance of 25 centimeters from thelens. The focal length is 8 cm. Find the image location and the height h of the image.
12)A 14-centimeter tall object seen through a lens with a focal length of 10 centimeters has an image half its size.a. Calculate the location of the image and the object. (HINT: Use proportions.)
EXTRA QUESTIONS
EXTRA QUESTIONS
1.A 12-cm tall object is placed 34 cm from a converging lens that has
a focal length of 14 cm. How far from the lens will the image be formed? How
tall is the image formed? Describe the
image formed.
2.Calculate the location of the image if the object is 20 centimetres
in front of a convex (converging) lens with a focal length of 5 centimetres.
Calculate the size of the image if the object is 5cm tall
3. For a converging lens with a focal length of 10 centimetres,
calculate the location of the object when the image appears 20 centimetres to
the right .
4.An object is at a distance of 3 centimetres from a lens with a focal
length of 1 centimetre. The lens creates an image on the same side of the
object. What kind of lens is this? What is the image location? Is the image
real or virtual?
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PRACTICAL-DETERMINATION OF THE FOCAL LENGTH OF A CONVEX LENS
https://www.youtube.com/watch?v=6C3UXLwvf-M
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