Help With Physics Assignment on Mirrors/Lenses

  • Thread starter Thread starter wakefreak90
  • Start date Start date
AI Thread Summary
The discussion revolves around a physics assignment focused on mirrors and lenses, with specific questions about concave and convex mirrors. The first question involves calculating the magnification of a concave mirror used by a dentist, while the second question requires determining the image location and height for an object placed in front of a concave mirror. The third question addresses the image formation of a robin in relation to a convex mirror. Participants are encouraged to share their attempts and difficulties to receive targeted assistance. The urgency of the assignment's deadline adds pressure for prompt responses.
wakefreak90
Messages
4
Reaction score
0
Please Help! Mirrors/lenses

I have been working on a Physics assignment for a long time now, and I can't seem to figure out three questions. It's due tonight, so any help would be greatly appreciated!

Here they are:

1. A dentist uses a small mirror of radius 36 mm to locate a cavity in a patient's tooth. If the mirror is concave and is held 13 mm from the tooth, what is the magnification of the image?

2. The sun falls on a concave mirror and forms an image 4.3 cm from the mirror. If an object 24 mm high is placed 13.4 cm from the mirror, where will its image be formed?

(a) Use the lens/mirror equation. Where will the image be formed?
2wrong check mark cm (from the mirror)
(b) How high is the image?

3. Shiny lawn spheres placed on pedestals are convex mirrors. One such sphere has a diameter of 45.0 cm. A 12 cm robin sits in a tree 1.2 m from the sphere. Where is the image of the robin?
(a)______ cm (from the mirror)
How long is the image?
(b)_____ cm
 
Physics news on Phys.org
Hi wakefreak90! :wink:

Show us what you've tried, and where you're stuck, and then we'll know how to help! :smile:

Start with 1 … what formula do you think is appropriate?
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
View full post »

Similar threads

Find the location and length of the final image
Replies
2
Views
886
Could the Image from the First Mirror Be Real for the Second Mirror?
Replies
7
Views
2K
Convex mirror question how long the image is?
Replies
4
Views
3K
Position of Final Image in Concave Mirror with Glass Block
Replies
13
Views
3K
What Is the Distance Between Two Images Formed by a Lens and Mirror Combination?
Replies
9
Views
3K
I Understanding magnification of concave mirrors for near-eye situation?
Replies
11
Views
2K
Calculating Di and Hi for Lawn Sphere Mirror Problem
Replies
1
Views
1K
The size of the image of the Sun
Replies
1
Views
1K
What Is the Focal Length of the Concave Lens in This Lens-Mirror Combination?
Replies
1
Views
2K
How to solve for distance of object with a concave mirror?
Replies
1
Views
2K

Hot Threads

Recent Insights

Back
Top