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vagabundo [1.1K]
3 years ago
10

When would a scientist use an oil immersion lens?

Biology
2 answers:
Slav-nsk [51]3 years ago
7 0

En microscopía óptica, la inmersión (generalmente en aceite, aunque también se puede efectuar en agua o con medios sólidos) es una técnica utilizada para aumentar el poder de resolución de un microscopio. Esto se consigue mediante la immersión en un aceite transparente de alto índice refractivo tanto de la lente del objetivo como del espécimen a observar, aumentando así la apertura numérica de la lente del objetivo.

Los aceites de inmersión son sustancias transparentes con las propiedades ópticas y las características de viscosidad necesarias para su uso en microscopía. Los aceites típicos utilizados suelen tener un índice de refracción de alrededor de 1,515.1​ Un objetivo de inmersión es una lente especialmente diseñada para ser utilizada de este modo. Muchas lentes condensadoras también proporcionan una resolución óptima cuándo están inmersas en aceite.

El primero en desarrollar está técnica a mediados del siglo XIX fue el óptico italiano Giovanni Battista Amici (1786-1863).

Grace [21]3 years ago
6 0
When light passes from a material of one refractive index to another (for example: from glass to air), it bends.
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What did charles darwin mean when he said some organisms where more fit than others
elena-s [515]
Darwin's idea of the survival of the fittest means that certain organisms are more likely to survive with they traits in particular environments. This is because some organisms are more fit to live in a given environment whether it be due to temperature, weather, or predators.

One example is that dark moths are more fit for survival than light moths in many areas because they are able to camouflage against dark tree bark.

Hope this helps.
5 0
3 years ago
16. One light year is the distance travelled by light in one year. If the speed of light is 3,00,000 km/s and light of the Sun t
meriva

Answer:

Distance=Speed×time

=300000×8.5 (1 minute= 60seconds)

Therefore 8.5×60=510seconds

=300000×510

=153000000Km

Explanation:

If you like my answer than please mark me brainliest thanks

5 0
3 years ago
Deep ocean food chains begin<br> with...<br> A. omnivores.<br> B. fungus.<br> C. chemosynthesis.
konstantin123 [22]

Answer:

B fungus

Explanation:

B fungus

4 0
3 years ago
Read 2 more answers
Describe the structure of a neuron. Include the cell body, dendrites, and axon in your description. How does the structure of a
igomit [66]

Answer: A neuron has three main parts: dendrites, an axon, and a cell body or soma , which can be represented as the branches, roots and trunk of a tree, respectively. A dendrite (tree branch) is where a neuron receives input from other cells. Dendrites branch as they move towards their tips, just like tree branches do, and they even have leaf-like structures on them called spines.

The axon (tree roots) is the output structure of the neuron; when a neuron wants to talk to another neuron, it sends an electrical message called an action potential throughout the entire axon.

The features of neurons help them to carry out their function efficiently:

they have a long fibre (axon) so they can carry messages up and down the body over long distances

in a stimulated neuron, an electrical nerve impulse passes along the axon

the axon is insulated by a fatty (myelin) sheath - the fatty sheath increases the speed of the nerve impulses along the neuron

at each end of the neuron are tiny branches (dendrons), which branch even further into dendrites - the dendrites receive incoming nerve impulses from other neurons

Explanation:

Hope this is helpful!!

4 0
2 years ago
A plant cell is placed in distilled water, as shown in the figure. There is a net uptake of water by osmosis, causing the cell t
Korvikt [17]

Answer:

The water potentials (Ψ) of the cell and its surroundings are the same.

Explanation:

When a cell is kept in hypotonic surroundings such as distilled water, the osmotic movement of water occurs towards the cell. The entry of water makes the cell swell up and it becomes turgid. Water potential is determined by solute and pressure potentials mainly. Here, the solute potential of the cell and the distilled water was different resulting in differences in their respective water potential values which in turn served as a driving force for endosmosis.

When the cell is fully turgid, the solute concentration of the cell and the surrounding distilled water become equal to each other. Under these conditions, the water potential of the cell and distilled water are the same.

7 0
3 years ago
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