Class 10 Exam > Class 10 Videos > Sign convention for Spherical Lenses and Lens Formula
Sign convention for Spherical Lenses and Lens Formula Video Lecture - Class 10
FAQs on Sign convention for Spherical Lenses and Lens Formula Video Lecture - Class 10
| 1. What is the sign convention for spherical lenses? |  |
Ans. The sign convention for spherical lenses is as follows:
- The object distance (u) is positive when the object is on the same side as the incident light.
- The image distance (v) is positive when the image is formed on the opposite side of the incident light.
- The focal length (f) is positive for converging lenses and negative for diverging lenses.
| 2. What is the lens formula? | |
Ans. The lens formula relates the object distance (u), image distance (v), and focal length (f) of a lens. It is given by the formula:
1/f = 1/v - 1/u
| 3. How do we determine the sign of the object distance (u) in the lens formula? | |
Ans. To determine the sign of the object distance (u), we consider the position of the object relative to the lens. If the object is on the same side as the incident light, u is positive. If the object is on the opposite side of the incident light, u is negative.
| 4. What does a positive focal length (f) indicate in the lens formula? | |
Ans. A positive focal length (f) indicates that the lens is a converging lens. It means that parallel rays of light converge to a point after passing through the lens. Converging lenses are also known as convex lenses.
| 5. What does a negative focal length (f) indicate in the lens formula? | |
Ans. A negative focal length (f) indicates that the lens is a diverging lens. It means that parallel rays of light appear to diverge from a point after passing through the lens. Diverging lenses are also known as concave lenses.
Text Transcript from Video
hello friends this video on light
reflection and diffraction pattern team
is brought to you by exam for calm no
move here from exam please make sure
that you have watched all the videos to
the part 16 before going ahead with part
17 now let us quickly look at the sign
Convention for lens it if this will also
be little similar to the sign Convention
for mirrors first of all the focal
length of a concave lens is negative
whereas the focal length of a convex
lens is positive so please remember
these points whenever we are talking
about focal length we generally talk
about we are generally constant into
consideration the second principal focus
so focal length of a concave lens when
you remember your concave me that the
focal length for a concave mirror was
also negative the focal length for
concave lens is negative and for convex
lens it is positive object distance on
the left of the optical centre so in
this case optical Center serves as the
pole so optical center acts as the
origin so anything on the left side of
optical center is negative anything on
the right side is positive similarly
when we talk about image distance that
also on the left side is negative and on
the right side is positive the object on
image height that is which is denoted by
H or H dash above the principal axis is
positive and below the principal axis is
negative right so these are some of the
common side conventions which were true
even for spherical mirrors now with this
in mind let us try to look at the lens
formula the way we have the mirror
equation which which was used to relate
the object distance with image distance
and focal length similarly we have
something point lens formula which
relates the image distance with object
distance and focal length of spherical
lenses so what is the mirror what is the
lens formula it is very similar to the
method equation except with a negative
sign it is 1 by V minus 1 by U
321 by F where V is the image distance U
is the object distance and F is the
focal length so this lens formula is
true for both concave lenses and convex
lenses but you need to take into
consideration the sign convention when
which when you try to solve problems
using this lens formula thank you please
visit exam viacom to watch free
educational videos try 3 online tests
get the best quality study materials
study from the best tutors and mentors
and much more thank you once again
reflection and diffraction pattern team
is brought to you by exam for calm no
move here from exam please make sure
that you have watched all the videos to
the part 16 before going ahead with part
17 now let us quickly look at the sign
Convention for lens it if this will also
be little similar to the sign Convention
for mirrors first of all the focal
length of a concave lens is negative
whereas the focal length of a convex
lens is positive so please remember
these points whenever we are talking
about focal length we generally talk
about we are generally constant into
consideration the second principal focus
so focal length of a concave lens when
you remember your concave me that the
focal length for a concave mirror was
also negative the focal length for
concave lens is negative and for convex
lens it is positive object distance on
the left of the optical centre so in
this case optical Center serves as the
pole so optical center acts as the
origin so anything on the left side of
optical center is negative anything on
the right side is positive similarly
when we talk about image distance that
also on the left side is negative and on
the right side is positive the object on
image height that is which is denoted by
H or H dash above the principal axis is
positive and below the principal axis is
negative right so these are some of the
common side conventions which were true
even for spherical mirrors now with this
in mind let us try to look at the lens
formula the way we have the mirror
equation which which was used to relate
the object distance with image distance
and focal length similarly we have
something point lens formula which
relates the image distance with object
distance and focal length of spherical
lenses so what is the mirror what is the
lens formula it is very similar to the
method equation except with a negative
sign it is 1 by V minus 1 by U
321 by F where V is the image distance U
is the object distance and F is the
focal length so this lens formula is
true for both concave lenses and convex
lenses but you need to take into
consideration the sign convention when
which when you try to solve problems
using this lens formula thank you please
visit exam viacom to watch free
educational videos try 3 online tests
get the best quality study materials
study from the best tutors and mentors
and much more thank you once again
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Dec 14, 2024 Last updated |
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