# Concave Lens Focal Length Experiment

Concave Lens Focal Length Experiment. Measure the distance v from the screen to the lens. The focal length of a concave mirror is negative in sign if we consider the traditional sign convention rule for the mirror and lens.

Lens will be approximately parallel when they reach the lens. 1 p + 1 q = 1 f (5) where p is the distance to the object. q is the distance to the image and f is the distance to the focus. The focal length of a concave mirror is negative in sign if we consider the traditional sign convention rule for the mirror and lens.

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To determine rough focal length of convex lens. Add all the focal lengths found out and find the mean value of the focal length of the convex lens.

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Obtain the image of the tree or the building on a white painted wall (screen) and move the lens forward and backward to get a sharp image on the wall. 1 p + 1 q = 1 f (5) where p is the distance to the object. q is the distance to the image and f is the distance to the focus.

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Concave lens mirror (concave. convex and plane) for colors or rays. 1/f = 1/f 1 + 1/f 2.

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Repeat the experiment for different values of u (up to 2. Thus. experimental focal length of the concave lens is valid.

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As per new cartesian sign convention. focal length of a concave lens is negative and the focal length of a convex lens is positive. Experimental focal length of the concave lens was calculated using equation 3.

Distance between the combination of lenses and object.u (cm) distance between combination of lenses and image.v (cm) focal length.f= (u*v)/ (u+v) nan. Optics bench experiments focal length of a thin lens

#### The Light Rays Will Then Refract As They Pass Through The Lens.

The focal length of a mirror is defined as the distance of its focal point from its pole. 1= 1 + 1 f do di where f is focal length. do is the distance between the object and the lens. and di is the distance between the image So. the power of a lens is defined as the reciprocal of its focal length.

#### Go Out In The Open And Face The Lens Towards Distant Tree Or Building.

Calculate the focal length ( f) of the concave mirror each time. 10 cm is the focal length of the concave mirror. As. the focal length of a convex lens is equal to the distance between optical centre and any of its focus.

#### The Focal Length (F 2) Of A Concave Lens Is Negative. Ii.

Here. we will discuss how to find focal length of convex lens. perform the convex lens experiment class 12 to obtain the focal length of a convex lens. V is the distance of iβ from the optical centre of the lens l2. Thus. experimental focal length of the concave lens is valid.

#### Measure The Distance V From The Screen To The Lens.

By the statement a concave mirror of focal length f we. So. focal length can be estimated by obtaining a real image of a distant object at its focus. Obtain the image of the tree or the building on a white painted wall (screen) and move the lens forward and backward to get a sharp image on the wall.

#### To Determine Rough Focal Length Of Convex Lens.

Distance between the combination of lenses and object.u (cm) distance between combination of lenses and image.v (cm) focal length.f= (u*v)/ (u+v) nan. Primary color spectrum and 1 to 5 rays. A concave mirror should be always placed near an open window.